Stoudios Monastery very close to the Golden Gate, the most important entrance gate of was built in 462 by a Roman patrician who lived in Constantinople. It was dedicated to John the Baptist.
Sources:
- Alexander Van Millingen et all: Byzantine Churches in Constantinople: Their History and Architecture , 1912
- Studios Manastiri (Imrahor Camisi)-http://tayproject.org/TAYBizansMar.fm$Retrieve?YerlesmeNo=20362&html=bizansdetaile.html&layout=web