Porta septemtrionalis is their Roman name. Through them, Emperor Diocletian stepped into the Palace on June 1, 305. They were built in the shape of a quadrangle, with double doors, as part of defensive military tactics (propugnaculum).
The façade is decorated with niches featuring sculptures by four tetrarchs (Diocletian, Maximian, Galerius and Constantius Chlorus). This gate, through which the road from the Peristyle, along Cardo Street, led directly to Salona as the capital of the Roman province of Dalmatia, was allowed to be used only by the emperor and members of their families. Today, with the nearby monument to Bishop Grgur Ninski, the work of the great Croatian sculptor Ivan Meštrović, they are one of Split's favorite tourist spots.
Influenced by Venice, the gate in the 16th century changed its name to Porta Aurea, or Golden Gate, which has survived to this day.