The headword first appears -- in the form Thrinakie -- in Homer, Odyssey 11.107; there it is a legendary island, home of the cattle and sheep of Helios. The identification with Sicily is later, involving other versions of the name (Trinakria, Trinachia) which reflect Sicily's triangular shape (trei=s, a)/krai). See Strabo 6.2.1, theta 499, and tau 993.