Ronah Tuatha Dé

Ronah is a member of the Tuatha Dé branch family whom was supposedly to be the next heir to the Tuatha Dé clan of assassins after Cian retires and due to the news of Ruff's death, but circumstances lead to him becoming the knight of the new head of the clan, Lugh Tuatha Dé.

(Source: The World's Finest Assassin Wiki)