Were Anadoluhisarı and Gül Mosque in Istanbul both constructed by the Ottomans?
Anadoluhisarı Anadoluhisarı (English: Anatolian Castle ), which is historically known as Güzelce Hisar (meaning "the Proper Castle") is a fortress located in Istanbul, Turkey on the Anatolian (Asian) side of the Bosporus, which also gives its name to the quarter around it in the Beykoz district. It was built between 1393 and 1394 by the Ottoman sultan Bayezid I "The Thunderbolt" as part of his preparations for the Second Ottoman Siege of Constantinople, which took place in 1395. Sultan Bayezid built it on the ruins of a temple of Uranus Originally named Güzelcehisar (Turkish: "Beauteous Castle" )
Sancaktar Hayrettin Mosque Sancaktar Hayrettin Mosque (Turkish: "Sancaktar Hayrettin Câmîi" ; also "Sancaktar Hayrettin Mescidi", where "Mescit" is the Turkish word for a small mosque, or "Sancaktar Mescidi") is part of a former Eastern Orthodox monastery converted into a mosque by the Ottomans. It is generally believed that the small building belonged to the Byzantine Monastery of Gastria (Greek: , "Monē tōn Gastríōn", meaning "Monastery of the Vases"). The edifice is a minor example of Palaiologan architecture in Constantinople, and is important for historical reasons.