Osterberg Castle was built circa 1015 by the Counts of Scharffenberg, lesser nobles subject to the Spanheims.
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Stephan I, Count of Sponheim (d. ca. 1080) is the patriarch of the Rhenish branch of the House of Sponheim, which ruled over the County of Sponheim.
Gottfried I of Sayn from the House of Sponheim (1247-1283/84) transferred his castrum Homburg to the German King Rudolf of Habsburg, in order to place it under his protection.