Euraxes

Euraxes is a dragon hatched from a clutch of eggs laid by Viserion. This egg was placed in the craddle of Maelor Targayen and was among the first dragons to hatch in it for many generations. Some say it was Daenerys I herself who did it. This female dragon's first rider was Maelor and with him, he secured the Stepstones.

Euraxes laid there the first clutch of eggs after mating with a male dragon, son of the dragon Leviatan. This eggs were placed in the craddle of Maekar Targaryen of the Stepstones and Aemond Targaryen of the Stepstones. Both had their respective dragons and thus the dragons of House Targaryen is linked to the matriarch Euraxes.