Tyrrhenicus
Could not find Tyrrhenicon in Logeion dictionaries.
Tyrrhenicon Proper-name adjective: neuter dative singular, Proper-name adjective: masculine accusative plural, Proper-name adjective: masculine ablative singular, Proper-name adjective: masculine dative singular, Proper-name adjective: neuter ablative singular of Tyrrhenicus
Tyrrhēnĭcus, a, um, tyrrhénien, de la Méditerranée : Aus. Ep. 24, 88 ; Suet. Claud. 42.