Igilium

IGILIUM(Giglio), an island off the coast of Etruria, directly opposite to the Mons Argentarius and the port of Cosa. It is, next to Ilva, the most considerable of the islands near the coast of Etruria, being 6 miles long by about 3 in breadth, and consists of a group of mountains of considerable elevation. Hence Rutilius speaks of its silvosa cacumina.(Itin. 1.325.) From that author we learn that, when Rome was taken by Alaric (A.D. 410), a number of fugitives from the city took refuge in Igilium, the insular position of which afforded them complete security. Caesar also mentions it, during the Civil War, in conjunction with the neighboring port of Cosa, as furnishing a few vessels to Domitius, with which that general sailed for Massilia. (Caes. B.C. 1.34; Plin. Nat. 3.6. s. 12; Mela, 2.7.19.) It is evident, therefore, that it was inhabited in ancient as well as modern times.
[E.H.B]