A.T. Robertson Commentary Matthew 22:19

"Show me the tribute money. And they brought unto him a denarius." — Matthew 22:19 (ASV)

Tribute money (το νομισμα του κηνσου). Κηνσος, Latin census, was a capitation tax or head-money, tributum capitis, for which silver denaria were struck, with the figure of Caesar and a superscription, e.g. "Tiberiou Kaisaros" (McNeile). Νομισμα is the Latin numisma and occurs here only in the N.T., is common in the old Greek, from νομιζω sanctioned by law or custom.