<prompt> Translate the following text to EnglishMnara wa zamani wa Byzantium ulianzishwa mnamo karne ya 12 na umekuwa ukitumika kama mnara wa ulinzi, ofisi ya forodha, na mnara wa udhibiti.  <response>: Originally a 12th-century Byzantine fort, the present tower dates from the 18th century, and has served as a lighthouse, customs office, and control tower. 