Udo von Hammerstien 
Udo von was born about 0968 in Hammerstein (now Czarne), Koszalin, Poland. Udo von's father was Herbert I Count of Gleiberg and his mother was Irmentrude of Avalgau. He had a sister named Irmentrude of. He was the older of the two children. He died on June 5th, 1036.
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