Angrivarii
The wars began in the last years of the reign of Augustus, first emperor of Rome. Augustus died an old but respected man in the year 14 and was celebrated with much pomp and splendor. He left a document to be read to the senate posthumously, expressly forbidding extension of the empire beyond the Rhine. News of the will was welcomed by the Germans, thinking it gave them a free hand in the region. Germanicus found it necessary to pacify the border, which he did by a combination of scorched earth raids and offers of alliance with Rome - in short, stick and carrot. These raids also kept the army of the lower Rhine distracted from the possibility of mutiny, which had broken out on Augustus's death and only been quelled by concessions and executions.
Coniuratio Italiae
The Oath of Italy ("Coniuratio Italiae") was an historical event taking place in 31 BC, by which Italy swore allegiance to Octavian Caesar in the Final war of the Roman Republic against Cleopatra and Mark Antony. Augustus himself retells the facts in the Res Gestae Divi Augusti: ""The whole of Italy voluntarily took oath of allegiance to me and demanded me as its leader in the war in which I was victorious at Actium."" Following the event, the Western provinces of Sicily, Sardinia, Spain and Gaul also sided with Augustus, and the same happened with the Eastern provinces and Egypt following the conflict. The Oath of Italy was foundational for the birth of the Roman Empire in a similar way the Oath of Brutus was declared to overthrow the Roman Kingdom, as both were used as an expression of the will of the people.