|Book(s)||A Dance with Dragons|
Gylo Rhegan is the commander of the Long Lances.
A Dance with Dragons
Rhegan accepted Yunkai's contract and was present at the sieges of Astapor and later Meereen. Daenerys secretly sends Ser Barristan Selmy to try and persuade Rhegan to turn his cloak and bring the Long Lances over to her.