Edward I (1239-1307), King of England, in whose reign the English claim to the Isle of Man was pressed and the Scottish possession of it contested.

The claim of the heirs of the Manx kings came before him and got nowhere. Mary, of the line that married into the Waldeboef family, had sought the Island and been told that she must lay her claim before the King of Scots, who then had possession of it. Her grandson John Waldebeof prosecuted his grandmother's claim in the parliament of the thirty-third year of Edward I, urging it before the King of England as lord paramount over the King of Scotland. The record gives him no more than leave to try elsewhere: that he might prosecute his title before the justices of the King's Bench, and let it be heard and justice done.

He reached into the Island's church as well. Bishop Mauritius was carried off to prison by Edward I, and Allen, or Onanus, was put in his place, to be followed by a succession of Scots in the see.

The chronologies of the Island mark his reign as the turn. One nineteenth-century account, explaining why the Isle of Man was included in a survey of Scotland, says that it had formed part of the territories belonging to Scotland in 1266, was taken under the protection of Edward I in 1290, and in 1307 was assumed by him as his own.