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In page Margareta of Celje:

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She was the only child of Herman III, Count of Celje (b. 1380? - d. after falling from his horse, 30 July 1426), by his first wife, Elisabeth (b. 1377? - d. bef. 1423), daughter of Baron Johann II of Abensberg and widow of Ulrich II of Schauenburg.[citation needed] From her mother's first marriage, Margareta had two older half-brothers, Johann I (d. 16 November 1453) and George I of Schauenburg (d. young, 1404).[1]