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Pliny the Elder Leaderboard as a city of Umbrians, and the Latin name Trebia could arise from the root-Umbrian treb, component of the words in that ancient language showed home construction, build. Its existence, the first of Roman domination, it also witnessed the "stele of Bovara" with archaic inscription found recently, but in its territory settled prehistoric civilization, as witnessed findings of Paleolithic. Bought great importance when, in imperial, was restored the ancient course of Flaminia and developed in the plains, in places Pietrarossa, a real civitas with monumental buildings of which remain numerous remains, while on the hill "continued to exist fortified with the arce sturdy walls of the first century BC, still visible. In ancient also had jurisdiction to "ville" mountain to the east and much of the valley below, crossed by Flaminia and crossed by Clitunno, then waterway. It was episcopal seat up to the eleventh century. With the domain of the Lombards, who created the powerful Duchy of Spoleto, Trevi was assigned to a gastaldo. At the beginning of the thirteenth century became a free commune, which alleatasi with Perugia to defend themselves from Spoleto was, with various events, struggling with common neighbors, getting free government only in 1389. It was ruled by various captains and, in particular, the deadly Vicariate of Trinci of Foligno until 1438 when, returned to direct dominion of the Church under the legation of Perugia, followed the fate of the Papal States until the unification. In 1784, Pius VI, was restored to the title of city
The territory of the municipality extends from the bottom (210 m above sea level) to the mountains, Brunette (1,422 m) and Serano (1,429 m), and can be equally apportioned in three distinct areas of plains, hills and mountains, covered with vegetation equally differentiated. In plain, the land fertilissimi and well-irrigated by many watercourses, formerly occupied mostly by the "lacus Clitorius", are sowing of species annually. The hill, alkaline limestone very "loose" and therefore very draining, is the ideal environment for growing intensive and highly specialized of olive, which gives a typical oil and much prized. The mountain is finally covered with forests, mostly cedui, and meadows.
The entire area offers extraordinary natural and environmental resources, despite intense man-made, because it is inhabited by millennia, including the mountain area now spopolata
For several decades, in fact, there is the abandonment of settlements shares higher and increasing population of the districts of the plains, now widespread phenomenon. The largest expansion, which began immediately after the war and is still in progress, mainly Borgo Trevi (businesses, offices and homes), Pietrarossa (industrial area) and Matigge (crafts, small industry, trade).
Rivers and canals, all of modest scope, flowing towards South-North and converge in a single collector around Bevagna. Their course is the result of secular land reclamation projects, already documented from the time of King Theodoric (sixth century) and protrattesi until today, when the dam was built to regulate the waters of the river Marroggia rain, which was subject to frequent and disastrous flooding.
The biggest of watercourses flow is the regular Clitunno, whose waters were attributed miraculous properties, so as to be deificato in Roman times and sung by many poets, from Latin classics until Byron and Carducci.
 
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