Adda Valley in the northern Italian region of Lombardy. It begins in the northeast in the Bormio basin (province of Sondrio) and ends with the mouth of the Adda into Lake Como. The Valtellina had the highest strategic importance as a link between Tyrol(Austria) and Northern Italy and therefore experienced a very eventful history with numerous changing dominions. In 1512 it came under the rule of the Swiss Confederates in the course of the Milan wars. Therefore the name has a Swiss-German background. It is probably derived from "Tellius", today's Teglio, an old village in the middle of the valley. With the Ligurian (sic) tribe, viticulture is said to have come to this area as early as 100 BC, even before the Romans. The Lombard DOC area Valtellina is also named after the Italian name. By the way, Valtellina has no ethymological or other connection to the Austrian Veltliner varieties.
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Markus J. Eser
Weinakademiker und Herausgeber „Der Weinkalender“