Ephesus was one of the seven churches of Asia that are cited in the Book of Revelation. The Gospel of John may have been written here.[9] The city was the site of several 5th-century Christian Councils (see Council of Ephesus). The city was destroyed by the Goths in 263, and although rebuilt, the city's importance as a commercial centre declined as the harbour was slowly silted up by the Küçükmenderes River. It was partially destroyed by an earthquake in AD 614. The ruins of Ephesus are a favourite international and local tourist attraction, partly owing to their easy access from Adnan Menderes Airport or from the cruise ship port of Kuşadası, some 30 km to the South.