Mary of Nassau-Siegen

Countess Mary of Nassau-Siegen (February 1491 – 1547), , official titles: Gräfin zu Nassau, Vianden und Diez, was a countess from the House of Nassau-Siegen, a cadet branch of the Ottonian Line of the House of Nassau, and through marriage Countess of Holstein-Schauenburg-Pinneberg.

Biography Mary was born in Vianden in February 1491 as the second daughter and sixth and youngest child of Count John V of Nassau-Siegen and his wife Landgravine Elisabeth of Hesse-Marburg. Her family spent most of the time there from 1489 onwards, because to get to know these new areas and to include them in his administration, Mary's father had to stay there for longer periods.

Mary married in February 1506 ). It was a double wedding, on the same day Mary's elder sister Elisabeth married to Count . The double wedding of Elisabeth and Mary was held at . A banquet was also held in the city hall in Siegen at which both brides and grooms were present. The feast with the city magistrates was paid for by the brides' father and the city council donated 16 oxen and 19 pigs for the feast.

Mary's husband was the son of Count John IV of Holstein-Schauenburg-Pinneberg and his wife Lady Cordula of Gemen. She had nine children including Adolf III of Schauenburg, Archbishop of Cologne from 1547 to 1556, Anton of Schauenburg, Elector and Archbishop of Cologne from 1556 to 1558 and Otto IV of Schaumburg (1517-1576), co-ruler from 1531 to 1560, ruling Count of Holstein-Schauenburg from 1560.

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