Originally, it was planned to extend the Albula Railway via the Maloja Pass, to Chiavenna in Italy.
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In 1890, the Davos hotelier Willem-Jan Holsboer proposed the construction of a rail link from Chur via Davos, and through a tunnel under the Scaletta Pass, to St Moritz, and then onwards via the Maloja Pass, to Chiavenna in Italy.
It was by one or other of these passes that Stilicho crossed the Alps in midwinter, a feat celebrated by Claudian (de B. Get. 320-358).
Maria Medina Coeli (1764 in Chiavenna – 1846 in Pianello Lario) was an Italian scientist.
The Milanese reeve of Como, Gian Giacomo Medici, who resided on castle Musso, had been raiding the valley of Chiavenna since 1521, and in 1526 he even occupied the Valtellina, both subject territories of the Three Leagues.
Most immigrants who arrived in Timbó came from Germany (Pomerania and Hamburg) and from Italy (Chiavenna and Trent).
In this period he worked also as Ducal engineer for Ludovico il Moro, designing fortifications at Chiavenna and Piattamale, as well as repairing of roads and bridges in Valtellina and (in the 16th century) hydraulic works; for Ludovico he also realized a Loggia in the Ducal Palace of Vigevano, as well as some statues for the Milanese Cathedral.
Prata Camportaccio borders the following municipalities: Chiavenna, Gordona, Mese, Novate Mezzola, Piuro, Samolaco.
San Giacomo Filippo borders the following municipalities: Campodolcino, Chiavenna, Menarola, Mese, Mesocco (Switzerland), Piuro, Soazza (Switzerland).
Already in use by the Romans, during the Middle Ages the Septimer Pass was crucial to the temporal power of the Bishopric of Chur whose extensive territories until the fourteenth century included Chiavenna.
The Comunità Montana della Valchiavenna, which coincides approximately with the Valchiavenna, includes the thirteen comuni of Campodolcino, Chiavenna, Gordona, Madesimo, Menarola, Mese, Novate Mezzola, Piuro, Prata Camportaccio, Samolaco, San Giacomo Filippo, Verceia and Villa di Chiavenna.