Lord of House Dayne, bannerman to House Martell
Arro Dayne is the current head of House Dayne, and the Lord of Starfall. He has sworn allegiance to Mors Martell and the strength of his house is committed to winning House Martell a kingdom of unified Dorne. His house has ownership of the sword called Dawn, said to be forged from the heart of a dying star.
Kalen Sand is his bastard son and was his heir for ten years until his wife gave him a trueborn boy and persuaded Arro to set Kalen aside for her own child.