Henry III, King /ˌhenri ðə ˈθɜːd $ -ˈθɜːrd/ BrE AmE
(1207–72) the king of England from 1216 until his death. He fought many wars in Europe, and this made him unpopular with the ↑ baron s (=men of the highest social class) . Led by Simon de Montfort, they fought against him but eventually lost.