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Male Otto von Diessen I Click to view Otto von Diessen I in the family tree

Otto was born in 1015 in Diessen am Ammersee, Bavaria, Germany.1   Otto's father was Count of Oberisar Friedrich of Diessen I and his mother was Kunizza von Oenningen.  His paternal grandparents were Margrave Berthold of Bavaria and Countess of Lorraine; his maternal grandparents were Emperor Conrad von Oehningen I and Richilde von Schwaben. He had two brothers named Berthold and Friedrich.  He was the youngest of the three children.

1 http://wc.rootsweb.ancestry.com/cgi-bin/igm.cgi?op=GET&db=glencoe&id=I10602

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