The oldest trace of a settlement in the area are scattered Bronze Age artifacts which were discovered in the Längenschachen area. The area remained inhabited through the Early Middle Ages and into High Middle Ages, when the Freiherr von Oberhofen built a castle on a hill above the village. About 1130 the Freiherr founded Interlaken Abbey and donated part of his lands to the Abbey. A few years later he donated another part of the village to the college of canons of Amsoldingen. In 1200, a daughter of the family, Ita, married into the von Eschenbach family and gave this family the castle and village. In the 13th century they began a new, moated castle on the shores of Lake Thun. In 1306 the von Eschenbach family was forced to sell Oberhofen and the castle to the Habsburgs. The Habsburgs appointed a succession of vassals to administer the area for them, especially the Kyburgs who also owned Thun Castle. Following the Kyburg defeat in the Burgdorferkrieg of 1383-84 and the decisive Habsburg defeat at the Battle of Sempach in 1386, Bern began to expand into the Austrian lands in the Bernese Oberland. They occupied Oberhofen in 1386 and were finally able to purchase or usurp all the land and rights from every feudal land holder in 1397. In the following year they sold the castle and Oberhofen "Herrschaft" to Ludwig von Seftigen, a citizen of Bern.