Myles is remembered as a brave and brash knight, completely unlike his brother William Mooton, who is mostly seen as cowardly and timid.
Myles serves as a squire to Crown Prince Rhaegar Targaryen alongside Ser Richard Lonmouth. Rhaegar personally knights Myles when he comes of age, and treats him as a friend. Myles' closeness to Rhaegar may have contributed to House Mooton siding with House Targaryen during Robert's Rebellion.
Myles fights during the uprising of Robert Baratheon, and travels with Lord Jon Connington to Stoney Sept, where he fights in the Battle of the Bells. Myles is killed by Lord Robert Baratheon in single combat, whilst Robert tried to escape Jon. Rhaegar was said to be hurt by his friend's death.