Which preposition to use with byblow

of Occurrences 1%

For the rest, his deportment in all functions of butlership is best described as super-Chesterfieldian; and, indeed, he was generally known to be a byblow of Captain Beverley Musgrave's, who in his day was Lichfield's arbiter as touched the social graces.

Which preposition to use with  byblow