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Legio Vigesima Prima Rapax "Twenty-first Predator legion" was a Roman legion levied in 31 BC by Augustus, probably from men previously enlisted in other legions. The XXI Rapax was destroyed in 92 by the Sarmatians.
The symbol of the legion is thought to have been a Capricorn. Augustus probably sent his new XXI'st legion to Hispania Tarraconensis to fight the campaign against the Cantabrians. XXI Rapax was one of the five legions used by Drusus to suppress the rebellion of the Raetians, in 16-15 BC. From 15 BC, the legion was stationed in Castra Regina (Regensburg), in the new province of Raetia. After the disaster of the Battle of the Teutoburg Forest, the legion was sent as reinforcements to Germania Inferior, where they shared the base camp of Castra Vetera (Xanten) with V Alaudae. Both Legio V and Legio XXI were involved in a mutiny in AD 14. In 43, they were relocated in Vindonissa, in the province of Germania Superior. The history of II Traiana Fortis gives an example of the political role of the legions. In 194, Pescennius Niger, governor of the province of Syria, rebelled with the support of, among others, II Traiana Fortis. His rival was Septimius Severus who would become emperor. In the days before the final battle, the legion changed sides and vowed fidelity to Severus. This would prove to be decisive for Pescennius' defeat. The legion occupied Vindonissa from 46 to 69 with two auxiliary cohorts, first the III Hispanorum and VI Raetorum, and later the VII Raetorum equitata and the XXVI voluntariorum civium Romanorum.
Along with the rest of the German border army, the XXI Rapax supported its commander, Vitellius, in the Year of the Four Emperors (69) and marched to besiege Rome. Vitellius was, however, defeated by Vespasian before the end of the year.