A Shrine of the Three Kings at Cologne Cathedral, according to tradition, contains the bones of the Three Wise Men. Reputedly they were first discovered by Saint Helena on her famous pilgrimage to Palestine and the Holy Lands. She took the remains to the church of Hagia Sophia in Constantinople; they were later moved to Milan (some sources say by the city's bishop, Eustorgius I), before being sent to their current resting place by the Holy Roman Emperor Frederick I in 1164. The Milanese celebrate their part in the tradition by holding a medieval costume parade every 6 January.