About two-thirds of the land in Hallau was originally owned by the Benedictine monastery of All Saints in Schaffhausen. In the tax record from 1100, there are no vineyards mentioned in the villages. It is not until the "Kelhofbrief" of 1280 that the local vineyards first appear. In 1302 the Bishop of Konstanz acquired the vogtei rights over both villages. In 1343 the village organized the "Gebursami ze Hallow" and secured the market rights, a mill, salt tax and other rights for themselves. In the 2nd half of the 15th Century the Bishop and the Landgrave of Sulz fought over the High justice rights in the Klettgau valley. During the Late Middle Ages and the Early modern period the villages expanded. They purchased the Lauferberg at some point, in 1457 they bought the Vogtei Wunderklingen an der Wutach and in 1507 the weir and water mill.