Casticus
Could not find Castico in Logeion dictionaries.
Castico Proper-name noun: masculine dative singular of Casticus
Ca'sticus
the son of Catamantaledes, a Sequanan, seized the government in his own state, which his father had held before him, at the instigation of Orgetorix, about B. C. 50. (Caes. Gal. 1.3.)