It is possible that the Roman emperor Nero planned another attempt to conquer Kush before his death in AD 68.[49]:150–151 Nero sent two centurions upriver as far as Bahr el Ghazal River in 66 AD in an attempt to discover the source of the Nile.[2]:43 Kush began to fade as a power by the 1st or 2nd century AD, sapped by the war with the Roman province of Egypt and the decline of its traditional industries.[50] Christianity began to gain over the old pharaonic religion and by the mid-sixth century AD the Kingdom of Kush was dissolved.[4]