| Notes |
- Herman op den Graeff was born November 26, 1585 in Aldekerk, Germany. He was the son of Johann Wilhelm, Duke of Jülich-Cleves-Berge through a morganatic marriage to Anna op den Graeff of the Op den Graeff family. Herman op den Graeff's mother being of low social rank, he was unable to inherit his father's titles and took his mother's family name.
Herman op den Graeff was a wealthy linen weaver and merchant. In 1605, he removed to Kempen where he met and married Greitgen Pletjes (or Greitje Pletjes)
In Krefeld, Op den Graeff became a leader of the Mennonite community, and in 1632, was one of two Krefeld Mennonite Church delegates to sign the Dordrecht Confession of Faith. In 1637, he was named as the "der hiesigen Mennoniten Herr Bischof" of Krefeld.
Some of Herman op den Graeff's descendents migrated to the United States. They are among the thirteen families often referred to as the Germantown, Philadelphia, Pennsylvania Founders, who arrived on the ship Concord on October 6, 1683. Among these families were three op den Graeff brothers, including grandson Abraham op den Graeff, a cousin of William Penn, the founder of Pennsylvania.
Pennsylvania Governor Samuel Whitaker Pennypacker was Herman's sixth-great grandson.
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