He was Edward III's representative in England and in 1355 he was made the Earl of Ulster. He went to Dublin in 1361 to be the Chief Governor of Ireland. His father made him Duke of Clarence in 1362, and tried to have him made King of Scotland. Lionel and the government in Dublin were concerned about how the English settlers in Ireland were slowly become Irish. He brought in laws, the Statute of Kilkenny, in 1366, which made it against the law: