Johan was the son of Konrad van Alster and Marie de Hamal. The date and place of his birth have not been found.
His wife was Maria von der Marck-Altena. They were married, but the date and place have not been found. Their only known child was Richarde (?-1425).
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Konrad van Alster |
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Jean de Hamal |
sir Guillaume de Hamal |
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Marie d'Oreye |
Guillaume d'Oreye |
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Johanna van Loon |
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