John of Islay (or John MacDonald) (Scottish Gaelic: Eòin Mac Dòmhnuill or Scottish Gaelic: Iain mac Aonghais Mac Dhòmhnuill) (died 1386) was the Lord of the Isles (1336–1386) and chief of Clan Donald. In 1336, he styled himself Dominus Insularum, "Lord of the Isles"; although this was not the first ever recorded instance of the title in use. Some modern historians nevertheless count John as the first of the later medieval Lords of the Isles, although this rather broad Latin style corresponds roughly with the older Gaelic title Rí Innse Gall ("King of the Isles"), in use since the Viking Age. For instance, the even more similar Latin title dominus de Inchegal ("Lord of the Hebrides"), applied to Raghnall Mac Somhairle in the mid-12th century. In fact John is actually styled Rí Innsi Gall or