A surname of Heracles, signifying the god who lives solitary, perhaps because he alone was worshipped in the temples dedicated to him. (Strab. iv. p. 202; Virg. Aen. vi. 831; Plut. Quaest. Rom. 87.) In Liguria there was a temple called Monoecus (now Monaco; Strab. Virg. ll. cc. ; Tacit. Hist. iii. 42; Steph. Byz. s. v.).