Thank you for your kind reply to my inquiry. Matthias Jennings was born in Welland but in 1809, as I now discover. He married, among his wives, an Ada Jennings who was aloso born in Canada, not sure where, but they ended up in Clayton county Iowa.(Do not know Ada's maiden name but she was much younger than her) He died in Iowa in 1864.
Back to the drawing board, over here in Chicago.
Marilyn