Argennis

(Ἀργεννίς), a surname of Aphrodite, which she derived from Argennus, a favourite of Agamemnon, after whose death, in the river Cephissus, Agamemnon built a sanctuary of Aphrodite Argennis. (Steph. Byz. s. v. Ἀργεννίς ; Athen. 13.608.) [L.S]