Olfen is a town in the district of Coesfeld, in North Rhine-Westphalia, Germany. Bishop Wolfhelm, who originated from the Ulfloa Oberhof, …Olfen is a town in the district of Coesfeld, in North Rhine-Westphalia, Germany. Bishop Wolfhelm, who originated from the Ulfloa Oberhof, gave the small town its name in 889. Wolfhelm was the fourth bishop of "Mimingardeford", today called Münster.