How the 'Three Wise Men from the East' ended up in Cologne

Cologne Cathedral houses the Shrine of the Three Kings, a reliquary which tradition says holds the bones of the Biblical Magi. But how did they get there?

source https://www.dw.com/en/how-the-three-wise-men-from-the-east-ended-up-in-cologne/a-67770427?maca=en-rss-en-ger-1023-rdf