and Celtic Oppidum Lindenhof On the then swamp area between Limmat and Lake Zurich around the present Sechseläutenplatz plaza, there were Neolithic pile dwellings which were set on piles to protect its inhabitants against occasional flooding by the rivers Sihl, Linth and Jona. Three settlements were located in Enge, a locality of the municipality of Zürich: Zürich–Enge Alpenquai and Kleiner Hafner on then islands or peninsulas on the effluence of the Limmat, and Grosser Hafner, as well as the settlement Kleiner Hafner near the present Sechseläutenplatz plaza on the effluence of the Limmat on Lake Zurich lake shore, all within an area of about some away of the core of the Celtic Oppidum respectively the Roman era Vicus. Probably in the first 1st century BC or even much earlier, the Celts settled on and around the Lindenhof hill. For the 1st century BC La Tène culture, archaeologists excavated individual and aerial finds of the Celtic Oppidum whose remains were discovered in archaeological campaigns in the years 1989, 1997, 2004 and 2007, and also the 1900s and 1930s finds which mistakenly were identified as Roman objects. Extraordinary are the single finds of 1890 at the Prehistoric pile dwelling settlement Alpenquai – the so-called Potin lumps whose largest weights consist of about 18,000 of used Celtic coins which date to around 100 BC. Initially prejudged just as melt coins, the present scientific research assumes that the melting down of the lump was not completed, therefore the aim was to form cultic offerings. The site of the find was at that time around from the present Bürkliplatz plaza in the Lake Zurich. Grosser Hafner was also an island sanctuary of the Helvetii in connection with the settlement at the preceding Oppidi Uetliberg and Lindenhof. Geography and area of the Roman settlement The core of the Helvetii and Roman settlement was the Lindenhof hill amidst the present Altstadt of the modern city of Zürich. The moraine hill was the site of the prehistorian settlements were the modern city historically has grown. The hilltop area dominates the city of Zürich alongside the eastern Limmat riverbank, and its northern slope called Sihlbühl towards the former Sihl delta marked the northern boundary of the Helvetii and Roman settlement – where the structures of the medieval Oetenbach Nunnery, Waisenhaus Zürich and later the Urania Sternwarte were erected at the present Uraniastrasse, and therefore important historical archaeological excavations never