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Volsinii (vŏlsĬn´ēī), ancient city of Etruria, Italy, on the site of modern Orvieto. It was a powerful member of the Etruscan League, and the spirit of the league was broken when Romans conquered and thoroughly sacked Volsinii in 264 BC A new Volsinii was founded near Lacus Volsiniensis (Lake Bolsena).