The foundation stone of Cologne Cathedral, built to house the relics of the Three Wise Men, is laid. (Construction is eventually completed in 1880.)

A cornerstone is the first stone set in the construction of a masonry foundation. All other stones will be set in reference to this stone, thus determining the position of the entire structure.

Cologne Cathedral is a cathedral in Cologne, North Rhine-Westphalia belonging to the Catholic Church. It is the seat of the Archbishop of Cologne and of the administration of the Archdiocese of Cologne. It is a renowned monument of German Catholicism and Gothic architecture and was declared a World Heritage Site in 1996. It is Germany's most visited landmark, attracting an average of 6 million people a year. At 157 m (515 ft), the cathedral is the tallest twin-spired church in the world, the second tallest church in Europe after Ulm Minster, and the third tallest church of any kind in the world.

 The Shrine of the Three Kings, Tomb of the Three Kings, or Tomb of the Three Magi is a reliquary traditionally believed to contain the bones of the Biblical Magi, also known as the Three Kings or the Three Wise Men. This shrine is a large gilded and decorated triple sarcophagus situated above and behind the high altar of Cologne Cathedral in western Germany. Built approximately from 1180 to 1225, it is considered the high point of Mosan art by various historians and scholars, and ranks amongst the largest reliquary in the Western world.

In Christianity, the Biblical Magi, also known as the Three Wise Men, Three Kings, and Three Magi, are distinguished foreigners who visit Jesus after his birth, bearing gifts of gold, frankincense, and myrrh in homage to him. In Western Christianity, they are commemorated on the feast day of Epiphany—sometimes called "Three Kings Day"—and commonly appear in the nativity celebrations of Christmas. In Eastern Christianity, they are commemorated on Christmas day.