Henry III, son of King John and Isabella of Angouleme, succeeded to the throne at the age of nine. His father had been fighting off a baron's rebellion in the east Midlands, as well as a briefly successful invasion of England by the future French King, Louis VIII. Although the rebels offered Louis the throne, when John died suddenly on campaign they soon rallied around the young Henry, perhaps seeing him a monarch over whom they could wield more influence. Louis was forced out of England and made to sign the Treaty of Lambeth, whose terms required him to agree that he had never been legitimate King of England.
During his minority, Henry's regent was William Marshal, Earl of Pembroke, who managed to retain popularity through his …
Editors. "Reign of King Henry III". The Literary Encyclopedia. First published 31 July 2012
[http://www.litencyc.com/php/stopics.php?rec=true&UID=634, accessed 28 June 2017.]