Symon Stripeback is the commander of the Free Brothers, a company of freedmen.
Symon is a former slave of Astapor. He is called Stripeback due to the scars he received by being whipped in the past by his slave masters. He was freed by Daenerys Targaryen.
A Dance with Dragons
Symon is named commander of the newly formed company Free Brothers. He is a member of the ruling council of Meereen and is present at several of its war council meetings.