Mese avenue, known today as Divan Yolu (Council Street). This street was used for imperial processions during the Byzantine and Ottoman era. It leads directly to the Hagia Sophia and turns northwest towards the palace square to the Fountain of Ahmed III. The Imperial Gate is the main entrance into the First Courtyard. The sultan would enter the palace through the Imperial Gate (, meaning "Royal Gate" in Persian, or Saltanat Kapısı) located to the south of the palace. This massive gate, originally dating from 1478, is now covered in 19th-century marble. Its central arch leads to a high-domed passage; gilded Ottoman calligraphy adorns the structure at the top, with verses from the Qur'an and tughras of the sultans. The tughras of Mehmed II and Abdulaziz, who renovated the gate, have been identified. According to old documents, there was a wooden apartment above the gate area until the second half of the 19th century. It was used as a pavilion by Mehmed, a depository for the properties of those who died inside the palace without heirs and the receiving department of the treasury. It has also been used as a vantage point for the ladies of the harem on special occasions. First Courtyard Surrounded by high walls, the First Courtyard (I. Avlu or Alay Meydanı) functioned as an outer precinct or park and is the largest of all the courtyards of the palace. The steep slopes leading towards the sea had already been terraced under Byzantine rule. Some of the historical structures of the First Courtyard no longer exist. The structures that remain are the former Imperial Mint (Darphane-i Âmire, constructed in 1727), the church of Hagia Irene and various fountains. The Byzantine church of Hagia Irene was used by the Ottomans as a storehouse and imperial armoury. This courtyard was also known as the Court of the Janissaries or the Parade Court. Court officials and janissaries would line the path dressed in their best garb. Visitors entering the palace would follow the path towards the Gate of Salutation and the Second Courtyard of the palace. The large Gate of Salutation, also known as the Middle Gate (Turkish: Orta Kapı), leads into the palace and the Second Courtyard. This crenellated gate has two large, pointed octagonal towers. Its date of construction is uncertain; the architecture of the towers appears to be of Byzantine influence. An inscription at the door dates