Old Gate
From A Wiki of Ice and Fire
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.
History
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. [1]