Frederick I, Count of Berg-Altena explained

Frederick I (1173–1198) was a count of Berg-Altena, the later County of Mark.

Frederick was the son of Eberhard I, Count of Berg-Altena, and inherited the south-eastern territory of Altena. He married Alveradis von Krieckenbeck-Millendonk, daughter of Reiner von Krieckenbeck-Millendonk, and they had issue:

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