Ictis

ICTIS in Britain, mentioned by Diodorus Siculus (5.22) as an island lying off the coast of the tin districts, and, at low tides, becoming a peninsula, whither the tin was conveyed in waggons. St. Michael's Mountis the suggested locality for Ictis. Probably, however, there is a confusion between the Isle of Wight, the Isle of Portland, the Scilly Isles, and the isle just mentioned; since the name is suspiciously like Vectis, the physical conditions being different. This view is confirmed by the text of Pliny (Plin. Nat. 4.30), who writes, Timaeus historicus a Britannia introrsus sex dierumnavigatione abesse dicit insulam Mictim in qua candidum plumbum proveniat;ad eam Britannos vitilibus navigiis corio circumsutis navigare.
[R.G.L]