House Velaryon

House Velaryon is an ancient noble house settled on the Isle of Driftmark and rule from the seaside castle of Driftmark. Their navy is among the most powerful on Westeros' east coast. They are allies to House Targaryen, intermarried in the recent past as the Targaryens sought to build alliances with their neighbors in the Narrow Sea.

Beginnings
House Velaryon migrated from the Valyrian Freehold well in advance of the Targaryens, eschewing the infertile and smoky island of Dragonstone for its lower, flatter, and much more fertile neighbor of Driftmark. They have ruled the island and its waters from the Driftwood Throne, situated in the great hall of Driftmark.

Recent History
The alliance between the Celtigars, Targaryens, and Velaryons is an old one, reinforced in the past couple decades by marriages and agreements. The Velaryons and to a much smaller extent the Celtigars rule the sea while covered by the Targaryens from above. Between the three of them, they've grown wealthy off of taxes demanded of ships traveling to Duskendale through Blackwater Bay.