Gero was created Count of Hassegau in 992, just a year before becoming margrave. He died in his territory in battle with a Polish army of Boleslaw I in Gau Diadesi and was buried in his family's monastery of Nienburg. He was survived by his wife Adelaide (Athelheidhe) and one son, Thietmar, who succeeded him.
Gero was created Count of Hassegau in 992, just a year before becoming margrave. He died in his territory in battle with a Polish army of Boleslaw I in Gau Diadesi and was buried in his family's monastery of Nienburg. He was survived by his wife Adelaide (Athelheidhe) and one son, Thietmar, who succeeded him.
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