Onsernone is a municipality in the Swiss canton of Ticino, near the city of Locarno. The river Isorno runs through this valley. The municipality was created in 1995 by a merger of Comologno, Crana and Russo. On 10 April 2016 the former municipalities of Vergeletto, Gresso, Mosogno and Isorno merged into Onsernone. History Comologno is first mentioned in 1438 as Comolognium. Crana is first mentioned in 1228 as Grana and in 1265 it was mentioned as Crana. Russo is first mentioned in 1231 as de Ruxi. In 1277 it was mentioned as Rusio. Isorno was formed in 2001 by a merger of Auressio, Berzona and Loco. Comologno During the Ancien Régime, Comologno belonged to the Squadra of Crana, which together with the other villages of the valley (with the exception of Auressio) formed the medieval municipality of Onsernone. With the establishment of the Canton of Ticino in 1803, Comologno became an independent municipality. Comologno formed an independent parish in 1715, when it separated from Russo. The parish church of San Giovanni Battista, was built in 1668–1697. With the emergence and development of rye straw processing in the 19th century, the population of Comologno increased rapidly. However, in the following century, the decline of farming, animal husbandry and straw craft led to a rapid population decline. Most of the working population works in industrial or service enterprises in the valley or commute to work in the agglomeration of Locarno. Many residents emigrated to other countries in search of work. Several families became wealthy in foreign countries, and used that wealth to build stately mansions in Comologno. The largest is from the Remonda family, who in the second half of the 18th century, became wealthy in France. Another notable mansion is the Palazzo (or Castello) della Barca which was acquired in the 1930s by Vladimir Rosenbaum for his wife Aline Valangin, a writer and artist. It soon became a haven for artists and well-known anti-fascists, including Ignazio Silone, Ernesto Rossi, Kurt Tucholsky, Hans Marchwitza, Ernesto Bonaiuti, Max Terpis, Elias Canetti, Wladimir Vogel and Jean-Paul Samson. Since the early 1970s, at the suggestion of the Associazione Amici di Comologno, various artists have decorated houses in the village with frescos. Crana During the Ancien Régime, Crana belonged to the Squadra of Crana which included the territory of Vocaglia, Comologno and Spruga, and was part of the old municipality of Onsernone. The modern village was