Zili has almost disappeared, Zilio is typically Veneto, with a strain also in Friuli, Zilli has an important strain in Friuli, one in the Piacentino, one in the province of Teramo and one in Salento, Zillino, extremely rare, could be Calabrian, in particular of Rosarno ( RC), Zillio, extremely rare is the Venetian, Zillo is absolutely rarest, should all derive from a dialect change of the medieval name Gilius of which we have an example in the diplomatic code of medieval Lombardy in a document written in Milan in 1132: "... A Petro qui dicitur Coco et Otta iugalium et ab Guiberto filio eius et Bellavida item iugalibus, unde odie cartam vendicionis fecerunt de alia medietate ipsius vinee sperm area eius in Manus et potestatem Anselmi qui dicitur Gilius, de Suprascripta civitate... ", Modification demonstrated for example by an act of 1362 written in Poschiavo in the Canton of Graubünden, where a certain Zillio was named Gabardo Venosta.
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