Premise: W. de Wycombe (Wicumbe, and perhaps Whichbury) (late thirteenth century) was an English composer and copyist of the Medieval era. He was precentor of the priory of Leominster in Herefordshire. It is possible that he was the composer of the most famous tune from medieval England, "Sumer is icumen in".
Hypothesis: W. de Wycombe was a German composer.