Today, Egrikapi is a neglected gate of the abandoned Byzantine castle and is located near Emperor Porphyrogennetos's palace. The gate's story is known to almost nobody living in modern Istanbul except for the few Greeks of the city. At the dawn of 29th May 1453, a group of Turkish soldiers entered the castle through it and broke the city's defense from within. The gate used to be a remote entrance to the castle, possibly for spies and supplies to enter during the night. The Turks might have secretly been watching the gate and and found the opportunity to invade in as soon as the Greeks opened it for a while. The gate had probably been lightly guarded, as a few miles away, at Romanos's gate, the major battle under Constantine Palaiologos's leadership was taking place. It's not clear whether there was a traitor responsible for opening the gate to the Turks but it's possible. Traitors have been the reason for many lost battles in history, but often they are invented in order to justify defeats simply caused by negligence.