The Dance of the Dragons, A True Telling
The Dance of the Dragons, A True Telling, at times simply called Munkun's True Telling, is a book written by Grand Maester Munkun about the civil war known as the Dance of the Dragons. It contains some inaccuracies.
A Dance with Dragons
When Haldon Halfmaester asks Tyrion Lannister if he can tell him the name of the knight who tried the same ploy Serwyn of the Mirror Shield used on the dragon Urrax with the dragon Vhagar during the Dance of the Dragons, Tyrion answers that it was Ser Byron Swann, who was roasted for his trouble, but he corrects the halfmaester by stating that the dragon had been Syrax, not Vhagar. Haldon tells him he is mistaken, mentioning The Dance of the Dragons, A True Telling by Maester Munkun as his source, only to be interrupted by Tyrion, who tells him that Grand Maester Munkun was wrong.
Tyrion explains that Byron's squire saw his master die and wrote of the manner of his death. The squire's account says that the dragon was Syrax, Rhaenyra Targaryen's she-dragon, which makes much more sense than Munkun's version as Swann was the son of a marcher lord, and Storm's End was for Aegon II Targaryen. Vhagar was ridden by Prince Aemond Targaryen, Aegon’s brother, making it, according to Tyrion, unlogical that Swann would have wanted to slay her.