"Conrad II of Reifenberg (German: Konrad II.; late 12th century – 18 December 1249) was Bishop of Hildesheim from 1221 to 1246. During his tenure, the Bishopric of Hildesheim was raised to an Imperial State (Hochstift), when Conrad was vested with secular rights of a prince-bishop by Emperor Frederick II in 1235." - (en.wikipedia.org 19.04.2021)
