Wroclaw was the one and only Un-Elemenstor.
At the time of the Great Undertaking Wroclaw was killed in the Battle of Yore (in Yore) by the lady Quilpa (who wasn't a godess at the time). His remains were taken to the altar of Escargoth which was situated nearby. Around the altar, the city of Yoreheim was built. The city was destroyed much later by Re-reformists during the The Sundering.
Wroclaw now haunts an inn owned by the Elemenstor Yulik Grundspeir.