Adalbert, archbishop of Magdeburg

Adalbert of Magdeburg, sometimes incorrectly shortened to "Albert", known as the Apostle of the Slavs, was the first Archbishop of Magdeburg and a successful missionary to the Polabian Slavs to the east of what was contemporarily Germany. He was later canonised and his liturgical feast day was assigned as 20 June.

The Archbishopric of Magdeburg was a Latin Catholic archdiocese (969–1552) and Prince-Archbishopric (1180–1680) of the Holy Roman Empire centered on the city of Magdeburg on the Elbe River.

June 20 is the 171st day of the year in the Gregorian calendar; 194 days remain until the end of the year.