ἀληθοποιέομαι

From LSJ

Kατεσκευάσθη τὸ ἱερὸν τοῦτο ποτήριον ... ἐν ἔτει ,αω'α' → Τhis holy cup was made ... in the year 1801

Source

Spanish (DGE)

verificar, hacer verdad τὸν λόγον Sch.Er.Il.21.34b.