 It is derived from the St. Katharinen-Spital in Esslingen, who not only possessed Deizisau for several centuries but additionally the villages Möhringen and Vaihingen a. d. Fildern taken over from the County Palatine of Tübingen.The origin of the duck leg on the right half of the herald on the other hand is unknown.The colours of the herald, red and gold, are the colours of the patrizian family "Bürgermeister von Deizisau", who owned Deizisau for a time during the Middle Ages.