 The Islay Charter, a record of lands granted to an Islay resident in 1408, Brian Vicar MacKay, by Domhnall of Islay, Lord of the Isles, is one of the earliest records of Gaelic in public use, and is a significant historical document.In 1437, the Lordship was substantially expanded when Alexander, the Lord of the Isles, inherited the rule of Ross maternally; this included Skye.The expansion of MacDonald control caused the ""heart of the Lordship"" to move to the twin castles of Aros and Ardtornish, in the Sound of Mull.