I have been searching with no success for my ancestor Ferdinand Hartzenberg, who is said to have come to the Cape of Good Hope / South Africa from Arnhem in the Netherlands. He was married in South Africa in 1777 to Gerbrecht Elizabeth Vosloo, and died on 14 November 1789 in Swellendam. On the assumption that his marriage to Gerbrecht was his first marriage, I guess he was probably in his twenties in 1777, which would mean he was born somewhere between 1747 and 1757. I would appreciate any assistance or guidance about where I can search for further details about him and his family in the Netherlands and document for his birth.
Thank you