 They associated the Quadi with their neighbours the Marcomanni, and described both groups as having entered the region after the Celtic Boii had left it deserted.The Quadi are thought to have been an important part of the Suebian group who crossed the Rhine with the Vandals and Alans in the 406 Crossing of the Rhine, and later founded a kingdom in northwestern Iberia.In the 1st century BC, according to Roman written sources, the more numerous Marcomanni, whose name simply means the "men of the borderlands", moved themselves from settlements elsewhere into a hilly area in the Hercynian forest known as "Baiohaemum", which is generally considered to have been the same as, or near to, modern Bohemia.