Little is known about the worship of Tiber (Tiberinus), which is very old, but Ovid recalls seeing games named after the river Tiber held on the Campus Martius. Festus records that the Ludi Piscatorii (June 7) were conducted by the city praetor on behalf of the fishermen of the Tiber. The celebrations were likely held on both banks of the river. The fish caught that day were not taken to the market but to the precinct of Vulcan where they were thrown live on the fire as substitutes for humans. This curious procedure has been construed to be an offering of creatures that would ordinarily be safe from the god of fire in exchange for things that might easily catch fire in the heat of June.