burgus de schona. The etymology of the toponym is unknown, there are several suggestions from 19th-century scholarship, all of them uncertain: from Latin scanum "alluvial sediment", from Latin ab abscondito, or from an uncertain early Romance asculà "pasture in uncultivated land". The German form of the name, Aschgunen, is recorded from the 16th century, when Locarno had come under the rule of the Old Swiss Confederacy. It is no longer in use. In the later Middle Ages, Ascona, Ronco, and Castelletto formed a village cooperative together. In 1321 it was mentioned for the first time, and in 1369, it had its own statutes. The history of Ascona during the Middle Ages is closely linked with that of Locarno. The important role of Ascona is reflected in the designation plebis Locarni Asconaeque which it was given in 1369. It is believed that in the 6th century, the Castle of San Michele was the site of a curia (court) and the seat of a sculdascio (Lombardic for officer) of the county of Stazzona, who exercised control over the entire parish of Locarno. In 1004, the court rights were transferred from the Archbishop of Milan to the Bishop of Como. In 1189 this gave the castle of San Michele to the Duni, one of the families of the Capitanei di Locarno. Other noble families from Locarno (Da Carcano, Castelletto, Muralto) settled in Ascona. They were joined by the Griglioni family that fled the wars between the Guelphs and Ghibellines of Milan. In the 12th and 13th centuries, the Duni enlarged their fortress (demolished in the 17th century) and the church of S. Sebastiano as well as having created a plaza around their residential home. The oldest fortification, probably, is the castle of San Materno. At its location, north of the village, there already seems to have been a Roman tower. The fort was occupied as early as the Early Middle Ages. In the 13th century, it was owned by the Orelli and Castelletto families. In the 17th century, only a part of the walls was still preserved. In the course of the 13th century, two new fortifications were built. The first was the Carcani Castle on the shore east of the Church of SS. Pietro e Paolo, and it was already demolished by the 2nd half of the 13th century. The second, was still further east, outside the inhabited area at that time.