At the Great Temple in Jerusalem the annual tax levied on Jews was 1/2 shekel per male. The 1/2 shekel and shekel were not always used in everyday commerce, but were the only coins accepted by the temple. Many taxpayers required a currency exchange, so money changers set up in the Temple court. Jesus found this business and their shouting (advertising rates) offensive, so he threw over their tables. "...go to the sea and cast a hook, and take up the fish that first cometh up; and when thou hast opened his mouth, thou shalt find a piece of money: that take, and give unto them [the temple tax collectors] for me and thee." -- Matthew 17:27. Since the tax was one half shekel per man the coin would have to be a shekel to pay the tax for both Jesus and Peter. Silver shekels and half-shekels of Tyre were minted from c. 126 B.C. until c. 57 A.D. Any coin minted prior to 32 A.D. may have circulated in Jerusalem during Jesus' lifetime.