The County of Blankenburg was a state of the Holy Roman Empire. Its capital was Blankenburg, it was located in and near the Harz mountains.
About 1123 Lothair of Supplinburg, then Duke of Saxony, had Blankenburg Castle erected in the Eastphalian Harzgau region. His liensman Poppo I of Blankenburg, a relative of Lothair's wife Richenza of Northeim, is documented as count over the Eastern Harzgau since 1128. He later also appeared as a ministerialis of the Welf duke Henry the Lion. After Poppo's death around 1161, his sons divided their heritage: Conrad took his residence at Regenstein Castle, 4 km north of Blankenburg, and became the ancestor of the noble House of Regenstein, while his brother Siegfried I retained Blankenburg Castle.
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