Sithonius
Could not find Sithoniae in Logeion dictionaries.
Sithoniae proper-name adjective feminine genitive singular, proper-name adjective feminine vocative plural, proper-name adjective feminine nominative plural, proper-name adjective feminine dative singular of Sithonius
Sīthŏnĭus, (14) a, um, de Thrace : Virg. B. 10, 66 ; Hor. O. 3, 26, 10.