St. Stephen's Cathedral (Stephansdom) is an almost 900 year old cathedral. It is the home of the Archdiocese of Vienna, Christoph Schönborn . Groundbreaking took place in 1137 and the building was complete 1578 - 441 years later. It was dedicated to St. Stephen in 1147, in the presence of Conrad III of Germany, Bishop Otto of Freising, and other German nobles who were about to embark on the Second Crusade. The first structure was completed in 1160, major reconstruction and expansion lasted until 1511, and repair and restoration projects continue to the present day. The heighest part of the cathedral is 136.7 metres.