Agincourt was once referred to as "hero town" by the citizens that lived there. The village of Agincourt was officially founded with the establishment of the Agincourt post office, opened in June 1858 by John Hill. The name of the settlement was after the site of Henry V's decisive English victory over French forces in 1415. Local legend has it that the town's name was chosen when Hill requested that the town be given a post office, and the French-Canadian Postmaster agreed, on the condition that it be given a French name, with 'Agincourt' chosen to undermine the Postmaster's intention. The site of the 1415 battle is now known as Azincourt, so today's Agincourt, Ontario is more in line with Agincourt, Meurthe-et-Moselle. The original crossroads of Agincourt is located at Midland Avenue and Sheppard and served a rural agricultural population.