The gate features three main inscriptions over its arches: on the sides, there are Latin texts, but the central text is in Greek. They inform that the gate was erected by two freedmen of Octavian Augustus and Marcus Agrippa, called Mazaeus and Mithridates. As a gravestone found in Ephesus states that Mithridates was the freedman of Agrippa, Mazeus must have been the one manumitted by Augustus. Thankful for the manumission, they had this gate built in the honour of Octavian Augustus, his wife Livia, his son-in-law Marcus Agrippa, and Julia the elder, the daughter of Augustus and the wife of Agrippa. The titles given to Octavian Augustus allowed dating the gate to the years 3-4 BCE. In this time, Agrippa had been dead for nine years and his widow, Julia, remarried to Tiberius. Thus, the inscription, in a delicate diplomatic manoeuvre, calls her "the daughter of Augustus" instead of mentioning her husbands.