premise: Henry III assumed the throne when he was 2 years old.
hypothesis: Henry III ( 1 October 1207 -- 16 November 1272 ) , also known as Henry of Winchester , was King of England , Lord of Ireland and Duke of Aquitaine from 1216 until his death . The son of King John and Isabella of Angoulême , Henry assumed the throne when he was only nine in the middle of the First Barons ' War . Henry supported his brother Richard in his bid to become King of the Romans in 1256 , but was unable to place his own son Edmund on the throne of Sicily , despite investing large amounts of money .