(Λύκιος), i. e. the Lycian, a surname of Apollo, who was worshipped in several places of Lycia, and had a sanctuary and oracle at Patara in Lycia. (Pind. P. 1.39; Propert. 3.1. 38; Verg. A. 4.143, 346, 377.) It must, however, be observed, that Lycius is often used in the sense of Lyceius, and in allusion to his being the slayer of wolves. (Comp. Serv. ad Aen. 4.377, who gives several other explanations of the name; Paus. 2.9.7, 19.3; Philostr. Her. 10.4; Eustath. ad Hom. p. 354.)

Lycius also occurs as the proper name of two mythical beings, one a son of Lycaon (Apollod. 3.8), and the other a son of Pandion. (Paus. 1.19.4.)