The Black Dread was is an infamous flagship, originally the personal ship of the former admiral master of Dragonstone. With sails as dark as a moonless night, and a hull painted to match, this legendary ship of Westeros and the Free Cities was every inch a regal vessel. Built for action, this ship could outsail any other sailing vessels.
Once Naerys Targaryen came into her abilities as a sailor and commander, she was given the Black Dread by the former admiral. Naerys has taken the ship from Dragonstone, around Westeros, and through the Free Cities more than once.
"Wherever we want to go, we go. That's what a ship is, you know. It's not just a keel and a hull and a deck and sails. That's what a ship needs. But what a ship is...what the The Black Dread really is...is freedom."
~Naerys to her crew.