The district is almost the same as the Prince-Bishopric of OsnabrÃ 1\/4 ck which existed until 1803 . The present combined territory of the district and the city of OsnabrÃ 1\/4 ck is almost identical to the Prince-Bishopric of OsnabrÃ 1\/4 ck which existed until 1802 , when it was mediatised and assigned to the Electorate of Hanover .