content: 
  ==References in other ''A Song of Ice and Fire'' novels==
  Ser Duncan the Tall is listed among notable Commanders of the Kingsguard in ''A Storm of Swords'', chapter 67. In the same chapter it is mentioned that Barristan Selmy defeated Ser Duncan the Tall in the winter tourney of King's Landing.
  The genealogy chart of Targaryens in the reference section of ''A Game of Thrones'', shows that Egg became King Aegon V (the Unlikely) and ruled from 233-259.  This was confirmed in ''A Clash of Kings'', wherein Maester Aemon is identified as his brother.
  In ''A Storm of Swords'', Prince Oberyn Martell remarks that "In the days of the Targaryens, a man who struck one of the blood royal would lose the hand he struck him with": a punishment evaded in ''The Hedge Knight''.
  In ''A Feast for Crows'', Brienne has her shield painted with arms that match Dunk's, copied from a shield in her father's armory. In the same novel, Brienne arrives at an inn owned by a possible descendant of Black Tom Heddle.
  In ''A Feast for Crows'', it is revealed that one of Egg's daughters married a son of House Baratheon and became the mother of Lord Steffon Baratheon, and thus the grandmother of Robert, Renly, and Stannis Baratheon. Aemon mentions that when he went to the wall, "He Egg sent me north aboard the Golden Dragon, and insisted that his friend Ser Duncan see me safe to Eastwatch". In the bonus features for Season One of ''Game of Thrones'' (on Blu-ray), Robert Baratheon states that this heritage allowed him to lay claim to the Iron Throne.
  In ''A Dance with Dragons'', the memories of Ser Barristan Selmy reveal that the sons of Aegon V, as well as Aegon himself, had chosen their own wives, rather than accept matches for political advantage. According to Ser Barristan Selmy, this stimulated resentment and treason amongst the lords, and ultimately caused the "tragedy of Summerhall".
  In the 2014 companion book ''The World of Ice & Fire'', mention is made of "Kingsguard knight Ser Duncan the Tall" during the reign of King Aegon V Targaryen (Aegon the Unlikely). In the Battle of Wendwater Bridge, during the Fourth Blackfyre Rebellion, Daemon III Blackfyre is slain by "Ser Duncan, the hedge knight for whom 'Egg' had served as a squire". During the rebellion of Lord Lyonel Baratheon (the Laughing Storm), it is noted that Ser Duncan had defeated Lord Lyonel in single combat.