|Died||In 130 AC, King's Landing|
Ser Byron Swann was among the two dozen knights present while Lord Borros Baratheon and Prince Aemond Targaryen haggled over the betrothal of the prince to one of Lord Baratheon's daughters. Bryon witnessed Prince Lucerys Velaryon's arrival and confrontation between the two princes. Shortly after, both princes left, resulting in the fight above Shipbreaker Bay and the beginning of the Dance of the Dragons.
About the same time of the Butcher's Ball, Bryon and his squire set out to slay Princess Rhaenyra Targaryen's dragon Syrax. He tried to kill the dragon by sneaking up behind his silvered shield so the dragon would see only its reflection, as Serwyn of the Mirror Shield famously did to the dragon Urrax.
Grand Maester Munkun stated in his book The Dance of the Dragons, A True Telling that it was Prince Aemond's Vhagar who Ser Byron tried to kill, in an effort to end the prince's raids across the riverlands. However, this is unlikely since House Swann supported the prince's brother, King Aegon II Targaryen, and the greens. Munkun largely drew his information from Grand Maester Orwyle, who was imprisoned at the time. The court fool Mushroom, at the side of Queen Rhaenyra, claims that Byron had attempted to kill Syrax, while Septon Eustace claimed that the knight tried to slay Sunfyre, the dragon of King Aegon II. The last claim is certainly a mistake, as Sunfyre's whereabouts were unknown at the time. Ser Byron's squire wrote his daughter about the knight's death, and said that Byron had faced Syrax.
All accounts agree that the dragon stirred upon Ser Byron's approach and unleashed its fire, burning through the mirror shield and roasting the knight.