Cythereius
Could not find Cythereia in Logeion dictionaries.
Cythereia proper-name adjective neuter nominative plural, proper-name adjective neuter vocative plural, proper-name adjective feminine nominative singular, proper-name adjective feminine ablative singular, proper-name adjective neuter accusative plural, proper-name adjective feminine vocative singular of Cythereius
Cўthĕrēĭus (Κυθερήιος), et Cўthērĭăcus, a, um, de Cythère, de Vénus : Ov. M. 10, 529 ; H. 7, 60 ; Cythereius heros Ov. M. 13, 625, Énée ; mensis Ov. F. 4, 195, le mois dʼavril [consacré à Vénus].