After a short period under the governance of the bishop of Bremen from 1421 to 1436 Delmenhorst returned under the custody of Oldenburg. Delmenhorst later was infamous for its robber-baronship under the count Gerhard VI of Oldenburg. Its reign ended in 1482 thanks to a siege laid to the castle under the leadership of the bishop of Münster. Therefore, the town now was under Münster authority until finally count Anton I won back the town as well as the castle in 1547.