Castrum Vitudurum, Roman archaeological site in Oberwinterthur, Switzerland.

Castrum Vitudurum is a Roman settlement in Oberwinterthur containing domestic dwellings, trade buildings, temples, and public structures spread across its excavated area. The site sits near St Arbogast church and reveals distinct phases of development from its Roman period.

The settlement began around 4 BC as a trading post and was later transformed into a fortified military fort under Emperor Diocletian in 294 AD. This conversion reflects shifting strategic needs along the Roman frontier.

The site reflects a Roman trading community where merchants and residents conducted daily business and religious practices. Its position near St Arbogast church links the ancient settlement to the region's later religious traditions.

Most remains lie around St. Arbogast church, at Unterer Bühl, Kastellweg and Bätmur Flur, so plan a route between these spots rather than expecting one enclosed site. The masonry temple foundations and the 294 AD fortification wall are the clearest features to look for. Finds from the excavations, including pottery and glass vessels, are held in Winterthur's collections.

The site preserves a sophisticated water system with spring captures and pipes serving different households. Wooden inscribed tablets and pottery fragments discovered here offer rare glimpses into the daily lives of Roman residents.