Rhogoro

From Asoiaf

Rhogoro is a Dothraki He is the son of Khal Moro.

Moro and Rhogoro visited Pentos. They were at Khal Drogo's feast. Other people attending the feast were Viserys III Targaryen and his sister Daenerys Targaryen, Magister Illyrio Mopatis, the brother of the Archon of Tyrosh and Ser Jorah Mormont.