When Gaius Jullius enters Rome after the conquest of Gaul, he decides to take on a different title from the senate: Bellator, a position combinding the war-fighting powers of Consul with treasurer powers, for life. He allows the Senate to maintain its other roles.
Julius Bellator, as his new name is, first travels through Gaul into Britain, where he then finishes the conquest of Britannia, which he sets up as the Prefecture of Britannia, the domain of his nominated succesor, Octavian. Octavian develops his mastery of warfare in warfare against the Scots and Picts in Hibernia. Cesar then goes on campaign in Northern Germania, conquering the upper third of the tribal entities. Ceasar then takes recruits from the Prefecture of Germania to supplement his Legions, and campaigns in Parthia. The Germanic Cavalry and infantry Auxilla (armed as slingers and velites) help defeat Parthian Cavalry.
In 30 B.C., Julius Bellator retires to a villa in Britannia. Octavian and Mark Antony become co-Bellators.
Mark Antony accepts the wishes of his friend Julius, and lets Octavian ascend to the Bellatorship. He does, however, use his and Octavian's influence to forge a more peacefull union with Ptolmaic Egypt. He marries Cleopatra, and leads joint Egyptian-Roman legions into inner Africa, vastly enriching Aegyptus. Upon his death by natural causes in 4 A.D., he wills his tough African troops to Octavian.
Octavian, with aid from Mark Antony's experienced African Campaign troops, defeats the Parthian Empire in 14 A.D., then died the same as in OTL.
Decade of Four Bellators
Tiberius is made Bellator, he expands Roman territory in Germania, but dies Campaigning three years later.