He was born on 26 November 1585 into a Mennonite religious family in Aldekerk (Duchy of Guelders, Holy Roman Empire), near the Dutch border.
[4][5] No substantial evidence of any relation between the Op den Graeff and the Duke has ever been presented, so most likely that connection is non-existent.
The windows were stolen from the Linn Castle during the chaos of the end of the Second World War and no longer correspond to the description given before the theft.
Images of the Op den Graeff windows: Following is the reproduction of both texts, in original German language and Translated english language, according to the line structure of the copy that was received:[14] and the translated English version: Disappeared text (glass plate replaced by depiction of the Virgin Mary) in original German language: and the translated English version: There is a reference about the Op den Graeff glass paintings of Krefeld with a description of Hermans possible, but not proven Coat of Arms was found in the estate of W. Niepoth (op den Graeff folder) in the archives of the city of Krefeld, who noted a letter dated November 17, 1935 from Richard Wolfferts to Dr Risler: Saw the Coat of Arms glass pane in the old museum: 'Herman op den Graeff und Grietgen syn housfrau' or the like.
[15] In 1632, Herman op den Graeff was one of two Krefeld Mennonite Church delegates to sign the Dordrecht Confession of Faith.
They are among the thirteen families, Original 13, the first organized immigration of a closed group of Germans to America, who arrived on the ship Concord on October 6 that year.