In the Roman era, along Pfäffikersee there was a Roman road from Centum Prata (Kempraten) on Obersee-Lake Zürich via Vitudurum (Oberwinterthur) to Tasgetium (Eschenz) on the Rhine.
In 1865 Jakob Messikommer succeeded the dating of finds at Irgenhausen, because of his experience in the dating of peat and concurrent findings at the Irgenhausen Castrum [REF].