Dietmar I (archbishop of Salzburg) explained

Dietmar I, also Theotmar I, was archbishop of Salzburg from 874 to 907. He died fighting against the Hungarians at Brezalauspurc on July 4, 907.

References

• Book: Bowlus, Charles R. . 1994 . Franks, Moravians and Magyars: The Struggle for the Middle Danube, 788–907 . University of Pennsylvania Press . 0-8122-3276-3.
• Book: Truhart, Peter . 2005 . Regents of Nations, Part 4: Europe, Volume 2: Eastern, Northern, and Central Europe, Annex: International Organizations . K.G. Saur . 978-3-598-21549-0.