Fenâri Îsâ Mosque was made of two former Eastern Orthodox churches. In 908, the Byzantine admiral Constantine Lips inaugurated a nunnery on the site. The church was built on the remains of another shrine from the 6th century, and used the tombstones of an ancient Roman cemetery. Relics of Saint Irene were stored here.
After the Latin invasion and the restoration of the Byzantine Empire, between 1286 and 1304, Empress Theodora, widow of Emperor Michael VIII Palaiologos (r. 1259–1282), erected another church dedicated to St. John the Baptist south of the first church.
In 1497–1498, shortly after the Fall of Constantinople, the south church was converted into a mescit (a small mosque). The edifice burned down in 1633, was restored in 1636 by Grand Vizier Bayram Pasha, who upgraded the building to cami ('mosque') and converted the north church into a tekke (a dervish lodge). The building burned once more in 1918, and was abandoned. During excavations performed in 1929, twenty-two sarcophagi have been found. The complex has been thoroughly restored between the 1950s and 1960s by the Byzantine Institute of America, and since then serves again as a mosque.
As a whole, this complex represents a notable example of middle and late Byzantine Architecture in Istanbul.
References:The ancient Argos Theater was built in 320 BC. and is located in Argos, Greece against Larissa Hill. Nearby from this site is Agora, Roman Odeon, and the Baths of Argos. The theater is one of the largest architectural developments in Greece and was renovated in ca 120 AD.
The Hellenistic theater at Argos is cut into the hillside of the Larisa, with 90 steps up a steep incline, forming a narrow rectilinear cavea. Among the largest theaters in Greece, it held about 20,000 spectators and is divided by two landings into three horizontal sections. Staircases further divide the cavea into four cunei, corresponding to the tribes of Argos A high wall was erected to prevent unauthorized access into the theatron and may have helped the acoustics, but it is said the sound quality is still very good today.
Around 120 CE, both theaters were renovated in the Roman style.