The Greek denarion is the denarius — the standard silver coin of the Roman Empire, equivalent to roughly one day's wages for a laborer. It was the most common coin in circulation throughout the New Testament world.
The denarius appears in several of the most vivid and theologically rich scenes in the Gospels. In the Parable of the Workers (Matthew 20), all workers receive one denarion regardless of hours worked — a parable about the scandalous equality of grace. In Matthew 22:19–21, Jesus asks whose image (eikon) is on the coin — 'Caesar's' — and delivers the famous answer: 'Give back to Caesar what is Caesar's and to God what is God's.' This famous logion establishes a theology of dual obligation and reveals that humans, bearing God's image (Genesis 1:26), owe God not coins but themselves. In John 12:5, the perfume poured on Jesus is valued at 300 denarii — a year's wages — making Mary's act of worship one of the most extravagant in Scripture.