THANK YOU all so much. Really, to have so many knowledgable replies in a short space of time is really appreciated. Thank you. I have much to follow now and hopefully uncover.
I do have the image from the King and also some rough family notes made by relatives of the past - that's where the prisoner story comes from with the Zerbes reference.
This side of the family are incredibly difficult to decipher - large families with multiple same names and unreliable dates of births etc!!
Again really kind of you all to give up your time and send so much help my way - I'll get cracking!
M