Hello there Tony, I know this thread is 5 years ago now but I hope you read this, I believe Rudolph Knebel is my great great grandfather and I can trace him back like this: my father is Peter, my grandfather's name is Arnold, then his father was Henry (I believe his full name was Henry William Rudolph) and then my great great grandfather was Rudolph (I believe his full name was Karl Heinrich Rudolph and he emigrated from Germany to London in the 1800s), my grandfather told me our ancestors 'dropped the von' from the name when emigrating to England, and he also told me one of our ancestors was a friend of Goethe, having done some research I believe this to be Karl Ludwig von Knebel, but whether he was a direct or indirect ancestor am not sure ..am trying to find out whereabouts in Germany Rudolph came from (my great uncle Martin thinks it may be the Ulm area, south Germany) and who his parents were, and how the family tree all fits together! Please do get in touch and we can compare family notes, Angela Sharman nee Knebel, in the UK