ancient meaning. As a Vicus, Turicum was not secured by town walls, but the buildings grouped around the customs station (Quadragesima Galliarum) where the clearance of goods and travelers prior to transfer between the provinces of Gallia Belgica and Raetia took place, mainly on the water route (from and to the Roman heartland over the mountain passes of the Swiss Alps) Walensee-Obersee-Zürichsee passing Centum Prata (Kempraten) towards the Limmat, Aare and Rhine. Goods and travelers, probably also towards Vitudurum (Winterthur), were handled at the Vicus before crossing the Roman provinces of Gallia Belgica and Germania Superior, and transferred on the Roman road between Vindonissa (Windisch) probably via Irgenhausen Castrum and Curia Raetorum (Chur). In Turicum a duty of 2.5% (Quadragesima Galliarum) was levied. In 70/75 AD a harbor district rose on the newly acquired lands on the Limmat riverbank at the foot of Lindenhof (Schipfe–Weinplatz), and the settlement area was extended on the right bank of the Limmat at the present Limmatquai. Public buildings made of stone and paved roads were built. In addition to the fire bed tombs from the 1st century AD at Münsterhof (Poststrasse), west of the Fraumünster church, also a round pit from the 2nd/3rd century was discovered, with numerous shards mainly of drinking cups and bowls, northeast of the church. At the site of the present Weinplatz towards St. Peterhofstatt the remains of remarkable 2nd to 4th century AD Thermae were excavated. Christianity may have been introduced in the 3rd century by Felix and Regula, with whom Exuperantius was associated – according to the Christian legend, Felix and Regula and their servant were executed at the location of the Wasserkirche in 286. Using the advantage of topography, the Roman military built a citadel on top of the Lindenhof hill in the years of the Roman emperor Valentinian I (364–375), to defend against migrations from the North by the Alamanni. 4500 m2 large, it was fitted with 10 towers and two meter wide walls. South of the Lindenhof Castrum, at the location of the St. Peter church, there was a temple to Jupiter. Grosser Hafner island sanctuary An island sanctuary of the Helvetii in connection with settlement the preceding Oppidi Lindenhof and the 1st century BC settlement at the Lindenhof hill may have probably go back to the La Tène culture. During the reign of Emperor Hadrian, a round wooden temple as an island sanctuary was