Equirria
Equirria or ECURRIA, a festival at which there were horse-races, said to have been instituted by Romulus in honour of Mars, in the Campus Martius. (Festus, s.v. Varro, L. L. 6.13, Müller.) There were two festivals of this name; of which one was celebrated a. d. iii. Cal. Mart., and the other prid. Id. Mart. (Ovid, Ov. Fast. 2.859, 3.519.) At a later date this festival was called Mamuralia, and a sacrifice was offered to Mamurius (Calend. Philocali). If the Campus Martius was overflowed by the Tiber, the races took place on a part of the Mons Caelius, which was called from that circumstance the Martialis Campus. (Paul. Diac. pp. 81, 131, M.)
From William Smith (ed.), Dictionary of Greek and Roman Antiquities. Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities and Tufts University. Data accessed from https://github.com/PerseusDL/canonical-pdlrefwk/ on 17 October 2026.