Aethan Velaryon was a head of House Velaryon and Lord of the Tides. His daughter, Alyssa, was married to Prince Aenys Targaryen in 22 AC.
Aethan served King Aegon I Targaryen as lord admiral and master of ships.
Aethan was aided by Prince Maegor Targaryen and Ser Osmund Strong during campaigns against Sargoso Saan, a pirate-lord of the Stepstones, in 29 AC and 30 AC.
A Lord Velaryon, possibly Aethan, advised King Maegor I to wed Princess Rhaena Targaryen. This Lord Velaryon was one of the first to declare for Jaehaerys I Targaryen against Maegor.