<Li> 1280--death of Albertus Magnus </Li> <Li> 1291--Acre, the last European outpost in the Middle East, is captured by the Mamluks under Khalil . </Li> <Li> 1299--Peak of Mongol supremacy in Southeastern Europe with Chaka of Bulgaria </Li> <Li> 1299--Osman I founds the Ottoman Empire . </Li>

A feature of the high middle ages in western europe was