Agonium, name for 9 January, 17 March, 21 May, and 11 December in the Roman calendar; also Agonalia (Ov. Fast. 1. 324; possibly Agnalia at 1. 325), Agonia (Varro, Ling. 6. 14), and Dies agonales (Varro, Ling. 6. 12), when the rex sacrorum sacrificed in the Regia (Festus Glossaria Latina 104 and Ov. Fast. 1. 317–38 with F. Bömer's notes). It had no associated god and the January celebration has no character letter in extant calendars; Macrobius (Sat. 1. 16. 6–8) makes it a fixed public festival (feriae publicae stativae).