Maria of Geldern was a noblewoman born around 1426 in the region of Geldern, which is now part of modern-day Germany. She belonged to the House of Jülich, a prominent noble family, and was known for her marriage to William IV of Holland, which helped strengthen political alliances in the region. Maria played a significant role in the politics of her time, particularly in the Low Countries. Her marriage produced several children, including Philip the Good, who became the Duke of Burgundy. Maria's lineage and connections contributed to the power dynamics in Europe during the 15th century.