Cynthius
Could not find Cynthium in Logeion dictionaries.
Cynthium proper-name adjective neuter vocative singular, proper-name adjective masculine genitive plural, Proper-name noun masculine genitive plural, proper-name adjective neuter nominative singular, proper-name adjective neuter accusative singular, proper-name adjective masculine accusative singular, proper-name adjective neuter genitive plural, Proper-name noun masculine accusative singular of Cynthius
Cynthĭus, (13) ĭī, m. , Apollon [honoré sur le mont Cynthus] : Virg. B. 6, 3.