Or, for those who prefer the HOTD family tree & character guide spelled out see below. All credit to the author "Lady S."
- King Jaehaerys I Targaryen, "the Old King" m. Princess Alysanne of House Targaryen(his sister)
- Prince Aemon Targaryen m. Lady Jocelyn of House Baratheon(his parents' younger half-sister/his aunt)
- Princess Rhaenys Targaryen Velaryon, "the Queen Who Never Was" m. Lord Corlys of House Velaryon, "the Sea Snake"
- Ser Laenor Velaryon, fought in his father's forces in their war on the Stepstones, allegedly killed shortly after his sister's funeral, though in actuality he and his current paramour fled to Essos once another man was killed in his place m. Princess Rhaenyra of House Targaryen (his second cousin)
- Prince Jacaerys "Jace" Velaryon
- Prince Lucerys "Luke" Velaryon, mutilated his half-uncle Prince Aemond by slashing through his eye, an act of self-defense as his, his elder brother's, and both Princess Baela's and Princess Rhaena's lives were being threatened
- Prince Joffrey Velaryon (named for Ser Laenor's murdered lover)
- Laena Velaryon, rejected at age 12 for a betrothal to King Viserys I in favor of Alicent Hightower, suicide by dragonfire during a difficult childbirth m. Prince Daemon of House Targaryen (her first cousin once-removed)
- Princess Baela Targaryen
- Princess Rhaena Targaryen
- Prince Baelon Targaryen, "Baelon the Brave", died of a burst belly 5 days after his father named him the King's Hand m. Princess Alyssa of House Targaryen (his sister, see below)
- Princess Alyssa Targaryen m. Prince Baelon of House Targaryen (her brother, see above)
- King Viserys I Targaryen, wielder of the ancestral Valyrian steel sword Blackfyre (passed from king-to-king) 1stm. Lady Aemma of House Arryn (his first cousin, see below) 2ndm. Lady Alicent of House Hightower
- Princess Rhaenyra Targaryen, "the Realm's Delight", eldest child of King Viserys I overall, and only surviving child by Queen Aemma, named Princess of Dragonstone and first female heir to the Iron Throne before her father's remarriage 1stm. Ser Laenor of House Velaryon(her second cousin), allegedly killed shortly after his sister's funeral, though in actuality he and his current paramour fled to Essos once another man was killed in his place, in a plot agreed to by Ser Laenor, his lover, Prince Daemon and Princess Rhaenyra, to facilitate her remarriage 2ndm. Prince Daemon of House Targaryen (her uncle)
- Prince Jacaerys "Jace" Velaryon, (actually sired by Ser Harwin Strong)
- Prince Lucerys "Luke" Velaryon, (actually sired by Ser Harwin Strong), mutilated his half-uncle Prince Aemond by slashing through his eye, an act of self-defense as his, his elder brother's, and both Princess Baela's and Princess Rhaena's lives were being threatened
- Prince Joffrey Velaryon, (named for Ser Laenor's murdered lover and actually sired by Ser Harwin Strong)
- Prince Aegon Targaryen, first surviving son of King Viserys I and his firstborn child by Queen Alicent
- Princess Helaena Targaryen, second daughter and third child of King Viserys I overall and secondborn child by Queen Alicent
- Prince Aemond Targaryen, second son and fourth child overall of King Viserys I and thirdborn by Queen Alicent, who lost an eye to a blade wielded by his half-nephew Lucerys after claiming Vhagar as his dragon
- Prince Daemon Targaryen, wielder of the Valyrian steel sword Dark Sister 1stm. Lady Rhea of House Royce, a wife abandoned in the Vale until her untimely death in a hunting accident 2ndm. Lady Laena of House Velaryon(his first cousin once-removed), suicide by dragonfire during a difficult childbirth 3rdm. Princess Rhaenyra of House Targaryen (his niece)
- Princess Baela Targaryen
- Princess Rhaena Targaryen
- Princess Daella Targaryen m. Lord Rodrik of House Arryn
- Queen Aemma Arryn Targaryen, died in her final childbirth m. King Viserys I of House Targaryen (her first cousin, see above)
- Princess Rhaenyra Targaryen, "the Realm's Delight", Princess of Dragonstone and first female heir to the Iron Throne 1stm. Ser Laenor of House Velaryon(her second cousin), allegedly killed shortly after his sister's funeral, though in actuality he and his current paramour fled to Essos once another man was killed in his place, in a plot agreed to by Ser Laenor, his lover, Prince Daemon and Princess Rhaenyra, to facilitate her remarriage 2ndm. Prince Daemon of House Targaryen (her uncle)
- 1 child dead in infancy, 2 stillbirths, & 2 miscarriages
- Prince Baelon Targaryen, "heir for a day" who died hours after his mother
Council and Kingsguard of King Viserys I Targaryen
Ser Otto Hightower, Hand of the King to Jaehaerys I in his final days and continued serving for Viserys I, until Viserys stripped him of his post, then made the Hand again after Lord Strong's tragic demise
Lord Lyonel Strong, formerly Master of Laws and then the second Hand of the King to Viserys I after Ser Otto was stripped of his post, killed in a fire at home in Harrenhal
Prince Daemon Targaryen, former Commander of the City Watch, previously Master of Laws and Master of Coin, left Westoros to join Lord Velaryon's war against the triarchy in the Stepstones
Lord Corlys Velaryon, "the Sea Snake", Master of Ships and husband to "the Queen Who Never Was", left Westoros to join Prince Daemon in war against the triarchy in the Stepstones
Grandmaester Mellos, healer and adviser, presumably died of natural causes some time after Princess Rhaenyra wed Ser Laenor
Grandmaester Orwyle, healer and adviser, formerly just one of several maesters helping to tend the many ailments of Viserys I
Lord Lyman Beesbury, Master of Coin
Ser Tyland Lannister, Master of Ships after the Sea Snake's departure
Lord Jasper Wylde, "Ironrod", Master of Laws after Lord Strong's promotion
Princess Rhaenyra Targaryen, a seated adviser as the king's heiress, formerly royal cupbearer
Queen Alicent Hightower, adviser
Ser Ryam Redwyne, legendary knight and Lord Commander of the Kingsguard, died in his sleep of an illness
Ser Harrold Westerling, veteran kingsguard and former sworn shield of Princess Rhaenyra, promoted to Lord Commander after Ser Ryam's death
Ser Criston Cole, commonborn son of House Dondarrion's steward with some Dornish heritage, veteran of border fighting against Dornish raiders for which he was knighted, named to the Kingsguard to fill the vacancy after Ser Ryam's death and chosen as Princess Rhaenyra's new sworn shield (and her paramour for one night), became Queen Alicent's sworn shield instead after Princess Rhaenyra's wedding
Ser Steffon Darklyn, a knight of the Kingsguard [s01e02 captions]
Dragons, courtiers, vassal lords, and other supporting characters
Balerion, "the Black Dread", a dragon House Targaryen brought from Valyria to Dragonstone and therefore the last surviving being to have known Valyria before its Doom after outliving several Targaryen partners; ridden by King Aegon I Targaryen during his Conquest and briefly ridden by King Viserys I Targaryen, who chose not to claim another dragon after Balerion's death and instead preserved his skull in memory
Syrax, Princess Rhaenyra's golden she-dragon, named for a Valryian goddess
Caraxes, "the Blood Wyrm", Prince Daemon's red dragon
Vhagar, "Queen of all Dragons", the oldest and largest surviving dragon, a dark green she-dragon ridden by King Aegon I's sister-wife Queen Visenya during their Conquest, last ridden by Prince Baelon the Brave, father of King Viserys I and Prince Daemon, until claimed by Lady Laena Velaryon at age 15, reluctuctly burned Lady Laena with dragonfire at her command to save her from death in childbed, then claimed by Prince Aemond the night after Lady Laena's funeral
Draemfyre, the she-dragon who produced the egg which Princess Rhaenrya had chosen for the lost Prince Baelon, an egg later briefly stolen by Prince Daemon, claimed by Princess Helaena
Seasmoke, Ser Laenor Velaryon's silver-and-pink dragon
Meleys, "the Red Queen", the scarlet-and-copper she-dragon ridden by Princess Rhaenys
Vermax, the olive-and-orange dragon bonded from birth to Prince Jacaerys
Sunfyre, Prince Aegon's dragon
Moondancer, the dragon bonded from birth to Princess Baela
House Velaryon of Driftmark
- Lord Corlys Velaryon, "the Sea Snake", (see council list above) m. Princess Rhaenys of House Targaryen, "the Queen Who Never Was"
- (see Targaryen family tree above)
- Ser Vaemond Velaryon, Lord Corlys's younger brother
- Ser Joffrey Lonmouth, "the Knight of Kisses", a knight sworn to House Velaryon who fought for them in the Stepstones, also Ser Laenor's paramour until he was beaten to death by Ser Criston Cole on Ser Laenor's wedding day
- Ser Qarl Correy, a knight who fought in the Stepstones when war was renewed years later, and Ser Laenor's paramour by the time of Prince Joffrey's birth, allegedly killed his patron shortly after Lady Laena's funeral, though in actuality he and Ser Laenor fled to Essos once another man was killed in his place, in a plot agreed to by Ser Laenor, Ser Qarl, Prince Daemon and Princess Rhaenyra, to facilitate her remarriage and Ser Laenor's freedom
- Maester Kelvyn, the healer and adviser serving House Velaryon, who treated the wounds of Prince Aemond and Princess Rhaenyra which were incurred the night after Lady Laena's funeral
House Hightower of Oldtown
- Lord Hobert Hightower
- Ser Otto Hightower, Lord Hobert's younger brother and twice Hand of the King to Viserys I, after serving King Jaehaerys I in his final days
- Ser Gwayne Hightower, Ser Otto's eldest son
- Queen Alicent Hightower Targaryen, Ser Otto's daughter and childhood friend-turned-adult enemy to Princess Rhaenyra m. King Viserys I of House Targaryen
- (see Targaryen family tree above)
House Baratheon of Storm's End
- Lord Boremund Baratheon, hosted Princess Rhaenyra at Storm's End as she assessed prospective suitors
House Lannister of Casterly Rock
- Lady Ceira Lannister, attended Queen Alicent's party during the royal hunt for Prince Aegon's 2nd name-day, exact relation to Lord Jason and Ser Tyland unclear (presumably their mother or perhaps unmarried aunt)
- Lord Jason Lannister, a failed suitor of Princess Rhaenyra
- Ser Tyland Lannister, Lord Jason's (slightly younger) twin and Master of Ships for King Viserys I after the Sea Snake's departure (see council list above)
House Stark of Winterfell
House Tully of Riverrun
- Lord Grover Tully, a lord so aged that his heir is already ruling the riverlands in his place
House Martell of Sunspear (ruling in Dorne, a region only nominally claimed by the Iron Throne in this time)
- Prince Qoren Martell, ruling prince of Dorne, allied with the Triarchy when they re-emerged to renew war against Westorosi ships in the Stepstones
House Beesbury of Honeyholt
- Lord Lyman Beesbury (see council list above)
House Strong of Harrenhal
- Lord Lyonel Strong, Hand of the King to Viserys I after Ser Otto's dismissal (see council list above), left to escort his heir back to Harrenhal, where they were both killed in a fire set by convicts working at the behest of his younger son
- Ser Harwin "Breakbones" Strong, Lord Lyonel's elder son, Commander of the City Watch (and Princess Rhaenyra's paramour) until shortly before his death, killed with his father at Harrenhal in a fire set by convicts working at the behest of his younger brother
- Lord Larys Strong, Lord Lyonel's younger son, crippled by a clubfoot, inherited Harrenhal after the tragic deaths of his father and elder brother
House Royce of Runestone
- Lady Rhea Royce Targaryen, heiress to Runestone until her untimely death m. Prince Daemon of House Targaryen, who failed to consummate the marriage and later killed the Lady Rhea by smashing his wife's skull in with a rock after startling her horse and causing her to fall
- Ser Gerold Royce, a cousin to the Lady Rhea who suspects Prince Daemon's hand in her death
House Redwyne of the Arbor
- Ser Ryam Redwyne, legendary knight and Lord Commander of the Kingsguard for Viserys I until he died in his sleep of an illness
- Lady Joselyn Redwyne, attended Queen Alicent's party during the royal hunt for Prince Aegon's 2nd name-day, exact relation to Ser Ryam unclear
House Caron
- Ser Royce Caron
- Ser Desmond Caron, a lauded tourney knight who brought a would-be poacher to justice in the Kingswood on his way to King's Landing, where he was rejected by Princess Rhaenyra for a spot in the Kingsguard
House Mallister of Seagard
- Lord Lymond Mallister
- Ser Rymun Mallister, knighted at 18, victor of the melee at Cider Hall, where he was the last mounted of a group of 23 knights, rejected by Princess Rhaenyra for a spot in the Kingsguard
House Dondarrion of Blackhaven
- Lord Beric Dondarrion, a failed suitor of Princess Rhaenyra who was old enough to have met Queen Alysanne, and presumably the same Lord Dondarrion that Ser Criston Cole's father served as steward
- Ser Arlan Dondarrion, the man who knighted Ser Criston Cole during their campaigns in the Dornish Marches, exact relation to Lord Beric unknown
House Caswell
- Lord Allun Caswell, a supporter of Princess Rhaenyra who was among the first to congratulate her and Ser Laenor upon the birth of Prince Joffrey
House Swann
- Lady Johanna Swann, captured by the Crabfeeder's men when one of Lord Swann's ships was attacked, rumored to have been sold to a pleasure house in Essos
House Stokeworth of Stokewoth
- Lady Elinor Stokeworth, Lord Stokeworth's daughter, betrothed to a son of Lord Massey squiring for House Tarly; meant to wed after the said squire earned his knighthood though it's rumored Lady Elinor was already with child
Mysaria, "the White Worm" , a former slave from a homeland she can no longer recall, Prince Daemon's chosen paramour and madam at a pleasure house until she changed professions to become a mistress of informers
Septa Marlow, governess and tutor to Princess Rhaenyra (and Alicent Hightower?)
Randyll Barret, a captain in the City Watch under Prince Daemon's command, helping sentence accused criminals to summary justice [s01e01 captions]
Samwell, Princess Rhaenyra's favorite bard
Howland Sharp, a royal huntsman [s01e03 captions]
Ser Addam, a knight of the royal household sent as a messenger to Prince Daemon on the Stepstones where he was beaten by the Prince upon arrival
Captain Oswin, captain of Princess Rhaenyra's ship on her failed tour to choose a husband
Annora, an unseen servant of Princess Rhaenyra's
Talya, a handmaiden serving Queen Alicent
Eddard, a servant helping King Viserys I with his model of Old Valyria
Across the Narrow Sea
Craghas Drahar, "the Crabfeeder" and self-styled "Prince-Admiral of the Triarchy" (said to be a Myrish princeling with quiet support from the Free Cities), making war on the Stepstones islands against pirates and later progressing to attacking Westorosi ships and feeding their sailors to crabs, eventually killed by Prince Daemon after 3 years of war
Prince Reggio Haratis, the Prince of Pentos, host to Prince Daemon and Lady Laena at the time of her death