The fiscus Iudaicus or Judaicus (Latin for “Jewish tax”) was a tax imposed on Jews in the Roman Empire after the destruction of Jerusalem and its Temple in AD 70. Revenues were directed to the Temple of Jupiter Optimus Maximus in Rome.

The Temple of Jupiter Optimus Maximus in Rome can be considered a fanum, an ancient (especially pagan) temple.

Therefore, the fiscus Iudaicus is a fanum (temple) tax.