Bucoleon Palace, Istanbul
This was one of the Byzantine palaces in Constantinople and was probably built by Theodosius II in the 5th century. The palace sits on the shore of the Marmara Sea, not far from the Little Hagia Sophia. The name Bucoleon was probably attributed after the end of the 6th century under Justinian I, when the small harbour in front of the palace, which is now filled, was constructed. Emperor Theophilos rebuilt and expanded the palace, adding a large façade on top of the seaward walls. The ruins suggest a balcony looking out to the sea was present, accessible through three marble-framed doorways, still visible today. The ruins of the palace were partially destroyed in 1873 to make way for the railway line to Sirkeci.
The remains of the Great Palace of the Byzantine Emperors is situated at sea level below the Haghia Sophia. It is not advisable to visit the insides of the ruins alone as they may fall apart and are inhabited by people who might not be too kind to tourists. What one can see today is all that now survives of the Bucoleon Palace, a maritime residence that formed part of the Great Palace.
This ruins of Byzantine Palace sites on the very good place near the see. Probably, when you walk along the ocean, you will notice this ruin.
Well, this was built in circa 830. It was constructed by Theophilos, and one of few ruins of old Great Byzantine Palaces.