Baku historian Sara Ashurbayli calculated that the tower must have been built in the 4th to 6th centuries AD. This was because of the tower’s unusual construction, the difference between the stone used in the tower and the stone of the medieval city surrounding it and the various legends about the Maiden Tower.
Another group of researchers think that the tower was built in the 11th century. The reason is the inscription 14 metres high on the south wall of the tower which reads Qubbeye Masud ibn Davud in old Arabic script[1]. Epigraphist Mashadikhanim Nemat studied the inscription and explained the word qübbə as qüllə or tower, so Masud ibn Davud would have been the tower’s architect. The architect of the 14th century Mardakan Tower, Abdulmajid ibn Masud, is thought to be his descendant[2].