created during the institutional changes of the Act of Mediation in 1803. Crana is known for the over 5,000 holders of heimatrecht in the village. The heimatrecht is similar to place of birth in other countries, and the heimatort is used on Swiss passports. A person maintains their heimatort regardless of whether they have ever lived in the municipality. The reason for the high number of heimatrecht holders is that the village sold the heimatrecht, which conferred local citizenry (and thus Swiss citizenship) to help make up for the low village income. The parish was created in 1787 when the village split away from the Russo parish. The Church of SS Peter and Paul was built in 1676. The present population is made up of retirees and commuters who work in the Onsernone valley and in the agglomeration of Locarno. Russo During the Ancien Régime, Russo belonged to the Squadra of Russo, part of the old municipality of Onsernone. The parish was probably created in 1656, when it separated from Loco. It included Comologno until 1715, Vergeletto until 1757, and Crana until 1787. The parish church of S. Maria Assunta is first mentioned in 1365, and was renovated in 1995–2002. Until about the mid-20th century, agriculture, animal husbandry and straw plaiting were the main sources of income in the village. This was supplemented by the traditional seasonal migration. While the number of inhabitants had decreased consistently over the decades, it began increasing in the 1970s. In 1989, the opening of the Centro sociale onsernonese nursing home provided a few dozen jobs in the village. Vergeletto In the Middle Ages Vergeletto belonged to the Onsernone Vicinanza and to the squadra of Russo. In 1803 the municipality of Vergeletto also included the municipality of Gresso, both municipalities separated into independent municipalities in 1882. Vergeletto was part of the parish of Russo until 1757, when it became an autonomous parish. Gresso The discovery of a Roman tomb from the 1st-2nd Century AD, with pottery and coins, proves that Gresso was part of the outer-most reaches of the Vicus of Muralto. The modern village of Gresso is first mentioned in 1316 as Agrassio. Until 1803, Gresso was part of the Squadra of Russo, one of five Squadre, that formed the medieval community of Onsernone. The village church has always been part of the parish of Vergeletto. The Chapel of S. Orsola was built in