Valentinian II
With the death of Valentinian I, in the east Valens became the senior "augustus" and the 16 year old Gratian was the only "augustus" in the western empire. To complicate matters further for Gratian, certain among Valentinian's generals then promoted his four-year-old second son Valentinian II (Gratian's half brother), the army on the Danube acclaiming him "augustus" in a palatine coup at Aquincum (Budapest) on 22 November 375, despite Gratian's existing prerogatives. The young Valentinian II was essentially the subject of the influence of his courtiers and mother, the Arian Christian Justina. Gratian's tutor, Ausonius, became his "quaestor", and together with the "magister militum", Merobaudes, the power behind the throne. Negotiations eventually left Gratian as the senior western emperor. Valens and Valentinian II were consuls for the year 376, Valens's fifth consulship. Neither Gratian or Valentinian travelled much, which was thought to be due to not wanting the populace to realise how young they were. Gratian is said to have visited Rome in 376, possibly to celebrate his "decennalia" on 24 August, but whether the visit actually took place is disputed.