Pfyn is a municipality in Frauenfeld District in the canton of Thurgau in Switzerland. Pfyn gives its name to the ancient Pfyn culture, one of several Neolithic cultures in Switzerland which centered on intensive pig farming and trading, dating from c. 3900 BC to c. 3500 BC. Pfyn was also the site of a Roman era frontier outpost, named Ad Fines (Latin: meaning "at the borders") History Pre-Roman Pfyn The oldest traces of a settlement are about west of Pfyn in the former peat bog of Breitenloo. Located in a depression carved by a lateral moraine of the Thur glacier, it dates from the Neolithic era (4300 BC). The settlement site was discovered during peat cutting in the late 19th century, but subsequently forgotten. During the war years 1940-41 an attempt to drain the bog to increase arable production land, led to its rediscovery. drainage work on arable production was raised again. In the autumn of 1944, an area of approximately was excavated by interned Polish soldiers led by Charles Keller-Tarnuzzer. Due to the topographical conditions, and an exploratory drilling project in 2002, it appears that about 60% of the settlement area has been excavated. Keller-Tarnuzzer noted that there was the close relationship of the ceramics with the Michelsberg culture of southern Germany, and believed that the Pfyn finds were a Michelsberg settlement. Around 1960 research determined that the Pfyn ceramics were represented an autonomous culture that was related to the Michelsberg culture. Since that time, the Pfyn-Breitenloo site has been regarded as the center of the Pfyn culture. Further explorations in 2002 and 2004 led to a somewhat more nuanced picture of the settlement. This enabled the site to be dated via dendrochronology. The timbers that were used were cut in 3706-3704 BC. and confirm a single development phase. Another Neolithic settlement must have existed some northwest of Breitenloo. However, the few ceramics discovered at that site are also part of the Pfyn culture. That settlement has never been systematically studied and it is believed that the industrial peat extraction during the second World War may have largely destroyed it. Because of Pfyn's importance as the home of the Pfyn culture and also as the site of a Roman era fort, other archeological discoveries have been largely ignored. For example, a number of Bronze Age artifacts and scattered grave sites were known to exist, but haven't been studied until