These included the barony of Alnwick and a large property in Northumberland and considerable estates in Yorkshire, including Malton.
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John sided with Simon de Montfort, 6th Earl of Leicester during the barons' rebellion against King Henry III, known as the Second Barons' War of 1263–64.
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In 1275, John was part of an expedition against Guðrøðr Magnússon, who was leading an uprising on Mann, in an attempt to establish himself as king.
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