Thirteen Families often referred to as the Germantown Founders, arrived on the ship Concord on October 6, 1683. The thirteen heads of household are: Leonard Arrets, Johannes Bleickers, Tones Coenen-Heggers, Peter Kurlis, Johann Lenssen, Johan Lucken, Reiner Theissen-Doors, Abraham Tunes Klinken, Wilhelm Strepers, Abraham Isacks Op den Graeff, Derick Isacks Op den Graeff, and Herman Isacks Op den Graeff.

The Op den Graeff family was in fact cousin to the founder of Pennsylvania William Penn. Penn's mother was the daughter of Jan Jansen of Rotterdam (Burke 1929, Lutz 1988, Miller  1991, Seitz 1719 & Ulle 1983).

1. Burke, Bernard. (1929). Burke’s Peerage 1929. Burke’s Peerage Ltd. London.
2. Lutz, J.S. (1988) History of the Op den Graef/Updegraff Family, P. U-2.
3. Miller, G.W. (1991) Reconstructing the Op Den Graff windows of 1630 A.D. to fit Lohengrin Genealogy of the House of Cleves. Krefeld Immigrants and Their Descendants, 8:1 9-28.
4. Seitz, D.C. (1719) Compleat Collection of State Tryals. 
5. Ulle, R.F. (1983) The Original Germantown Families. Mennonite Family History. April.

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