Clan Donald, also known as Clan MacDonald ( ), is a Highland Scottish clan and one of the largest Scottish clans. The Lord Lyon King of Arms, who is the Scottish official with responsibility for regulating heraldry in that country, issuing new grants of coats of arms, and serving as the judge of the Court of the Lord Lyon, recognizes under Scottish law the "High Chief of Clan Donald". Historically the chiefs of the Clan Donald held the title of Lord of the Isles until 1493 and two of those chiefs also held the title of Earl of Ross until 1476.