 On 24 August 367 he received from his father the title of "Augustus".When his father died on 17 November 375, Gratian began his actual reign at the age of sixteen.Six days later, Gratian's half brother Valentinian II, Valentinian's four-year old son by his second wife Justina, was also proclaimed Emperor by troops in Pannonia, impelled by the generals Aequitius and Maximinus, two of Valentinian's more unscrupulous ministers.