What were the Gates of Jerusalem?

According to the Bible, before King David's conquest of Jerusalem in the 11th century BCE the city was home to the Jebusites. The Bible describes the city as heavily fortified with a strong city wall. The city ruled by King David, known as Ir David, or the City of David, is now believed to be southwest of the Old City walls, outside the Dung Gate. His son King Solomon extended the city walls and then, in about 440 BCE, in the Persian period, Nehemiah returned from Babylon and rebuilt them. In 41-44 CE, Agrippa, king of Judea, built a new city wall known as the "Third Wall."

Golden Gate	Gate of Mercy, the Gate of Gold, the Gate of Eternal Life, Sha'ar Harahamim - appears in the legends of all three religions. An early Jewish tradition holds that it is through that gate that the Messiah will enter Jerusalem. According to Christian tradition, Jesus made made his last entry to Jerusalem through the Mercy Gate. The Muslims refer to it as the Gate of Mercy and believe it to be the gate referred to in the Koran, through which the just will pass on the Day of Judgment.
Herod's Gate - Flower Gate	The first name was given to the gate by pilgrims, who erroneously believed that it led to Herod's palace. It is known in Arabic as the Flower Gate.
Lion's Gate	Known in Hebrew as the Lion's Gate. Legend has it that the lions engraved on both sides of the gate were placed there by the Ottoman Sultan Suleiman the Magnificent, because he had dreamed that he would be devoured by lions unless he built a wall around the Holy City for the defense of the citizens.
Zion Gate	The western gate of the Old City, named after Mount Zion. In Arabic it is known as "the Prophet David's Gate", because one passes through King David's tomb on Mount Zion.
Damacus Gate	The most massive and ornate of all of Jerusalem's gates. The road running off it leads to Shechem (Nablus) and then to Damascus.
Jaffa Gate	This gate is the principal entrance to the Old City. Its name in Arabic is Bab-el-Khalil, the gate of Hebron, as the main road to Hebron started here. It was also called Jaffa Gate because the road to the port city of Jaffa (Joppa) - the coast also started from it. This gate is the only one on the western side of the Old City. A low part of the city wall was torn down and the Crusader moat of the Citadel filled in 1898 for the visit of the German Kaiser Wilhelm II. This gate was also the famous scene of the English General Allenby's entrance in 1917.
Dung Gate	The Dung Gate is mentioned in the book of Nehemiah as a dispatch point for the city's refuse. It would appear that it was through this gate that the refuse was removed from the city.
Sha'ar Gate	Nehemiah mentions that he began his trip to the city from Sha'ar HaGai. The name refers to a site on the way to Jerusalem. The Hebrew name Sha'ar HaGai is a translation of the Arabic Bab el Wad, the Valley Gate, which leads to Jerusalem.

Reference: Reference: Bible Places.com | Old City (Jerusalem) Wikipedia