Calvisius was praetor possibly in 46, but more likely in 44 BC. In 45, he was governor of "Africa Vetus", the province formed from Carthaginian territory after the Third Punic War, while C. Sallustius Crispus, the historian usually known as Sallust, became the first governor of "Africa Nova", the province created by Caesar from the former kingdom of Numidia. The previous year, the senatorial forces had rallied in Africa after their defeat at Pharsalia, and the Battle of Thapsus meant that the outcome of the war had been determined on African soil. Calvisius had returned to Rome sometime before 15 March 44, when he was present in the senate during Caesar's assassination, but he had left two legates at Utica who may have caused trouble for his successor, Quintus Cornificius.