Seastar

Hatched from an egg from a bygone era, produced by the Good Queen’s dragon, Silverwing. When Aenar I was prince of Dragonstone, he collaborated with Maester Selwyn in discovering a small cache of eggs left behind by Silverwing at Red Lake. Selwyn, through some arcane means, managed to hatch the egg. A feat that saw him personally raised to the rank of Archmaester, as well as providing new blood for the dragons. Seastar was a lithe, elegant dragon named for Shiera Seastar by Princess Vaella. By and large of a tamer sort, Seastar has rarely been confined to the Dragonpit. Upon the Isle of Driftmark, where Seastar once made her home, she laid a clutch of eggs.

Riders

 * 1) Vaella Targaryen. Claimed from 356 A.C. to 404 A.C.
 * 2) Lucerys Velaryon. Claimed from 405 A.C. to 426 A.C.
 * 3) Gael Targaryen. Claimed from 426 A.C. to Current.