Kατεσκευάσθη τὸ ἱερὸν τοῦτο ποτήριον ... ἐν ἔτει ,αω'α' → Τhis holy cup was made ... in the year 1801
Celt, Kelt = Κέλτης
Celts, Kelts = Κελτοί, οἱ.
Celtic, Keltic, adj.: Κελτικός.