Aosta's oldest mapped tree is one lime, standing in a raised bed beside the Collegiata dei Santi Pietro e Orso in the historic Borgo Sant'Orso. Local legend credits a sixth-century hermit with planting it; the tree the city actually protects was set into the ground roughly a thousand years later, in the 1530s or 1540s. Its hollow crown, held together now by metal braces, has been a national monument since 1924. Free to see, a short walk from Piazza Chanoux.
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写真：Geobia (CC BY-SA 3.0)
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The Linden of Sant'Orso
Large-leaved Lime (Tilia platyphyllos) · roughly 475 years · Borgo Sant'Orso, Aosta
Legend says a sixth-century hermit planted this lime with his own hands, and the tree the city protects today contradicts him: its documented planting sits in the 1530s or 1540s, roughly a thousand years after Saint Orso is meant to have died. The two stories should not be joined. What is recorded is that an earlier tree, an elm or an earlier lime, stood on this spot before, and this lime replaced it sometime in that Renaissance decade, which still makes it one of the oldest trees in the Aosta Valley.
Its trunk has hollowed from the base up to the first branching, and metal braces now hold the crown from splitting the shell apart, a slow, monitored decline rather than an abandoned ruin. Italy listed it a national monument in 1924 and regional law has protected it since 1990. Local memory keeps the valley's council of elders meeting in its shade to settle disputes, though nobody has dated that tradition either.
It stands in a raised planter bed beside the Collegiata dei Santi Pietro e Orso, whose Romanesque cloister already draws its own visitors, in the historic borgo that carries the saint's name. You can see it clearly from the street. You cannot touch the trunk: the bed keeps everyone a few steps back, which for a tree this hollow is probably the point.
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