The Old Gate is one of the seven huge gates that surround the huge walls of King's Landing. It is located near the center of the northwestern wall near Rhaenys's Hill.
In the reign of Maegor I Targaryen, Maegor had his own wife and queen, Alys Harroway, tortured to death and executed. Following her death, Alys's body was cut into seven parts and mounted on spikes above each of the seven gates of the city, one of which was above the Old Gate. 
During the Dance of the Dragons, a massive riot broke out in the city. The captains of the Old Gate and Dragon Gate managed to sally out and restore some semblance of order to the streets north and east of Rhaenys's Hill. 
In the Regency of Aegon III, the Hand of the King, Tyland Lannister commanded the city gates to be strengthened so they could better resist attacks from within the city walls. 
- ↑ The Sons of the Dragon.
- ↑ The World of Ice & Fire, The Targaryen Kings: Maegor I.
- ↑ The Princess and the Queen.
- ↑ Fire & Blood, Under the Regents - The Hooded Hand.