Caspiacus
Could not find Caspiacae in Logeion dictionaries.
Caspiacae 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 Caspiacus
Caspĭăcus, a, um, Stat. S. 4, 4, 64, c. Caspius.