John of Strathbogie, 9th Earl of Atholl  was the son of David of Strathbogie, 8th Earl of Atholl and Isabel  of Chilham.1  He married Margaret (?), daughter of Donald, 6th Earl of Mar and Helen  ferch Llywelyn.1  He died on 7 November 1306 at London, England, executed, with his body burnt and his head fixed on London Bridge (and his titles forfeited).1

    John of Strathbogie, 9th Earl of Atholl succeeded to the title of 9th Earl of Atholl [S., c. 1115] on 6 August 1270.1 On 5 February 1283/84 he was one of the nobles who acknowledged Margaret, Maid of Norway, as their Sovereign.1 In 1292 he swore fealty to King Edward I.

He fought in the Battle of Dunbar on 28 April 1296 at Dunbar, East Lothian, Scotland, fighting on the side of the Scots, who were defeated. He was taken prisoner to London.1 On 31 July 1297 he was ordered to be released from the Tower of London.1 On 27 March 1306 he assisted at the coronation of King Robert Bruce of Scotland.

http://thepeerage.com/p10786.htm#i107856 -------------------- His father was the Earl of Lennox.