 On occasion of diving operations from 1998 to 2001 almost of tile fragments are ensured, and up to 40 coins and several pottery shards, as well as rectangular post hole.The Alamanni settled in probably from the 5th century when the Roman military retreated back to Italy, but the Roman castle persisted into the 7th century and was reinforced by the Ottonian dynasty, but broken around 1218 AD.To date, few archaeological remains of the Roman Zürich could be excavated systematically because the remains of the settlement are hidden under the densely built-up core of the modern city of Zürich.