If fans remember correctly, Daenerys Targaryen had a secret weapon in dealing with the masters in Slayer's Bay, because High Valyrian ... the House to keep their line pure. House Velaryon's ...
The dragonlords of the former Valyrian Freehold were the only dragonlords in the world. In Westeros, that means someone must have ancestry with either House Targaryen or House Velaryon (even ...