I've been checking up some on the HATFIELD family (Tyrrell, Washington, Perquimans cos. and environs), and I found an Amariah Biggs HATFIELD born around the same time as your A. B. MANNING, but HATFIELD was in Perquimans county. I was thinking he must have been named for a grandfather or something, but after reading your query, it looks like Amariah BIGGS was perhaps just an influential man. Please post any further info you find on this BIGGS. Thanks!