Saint Helena measures about 16 by 8 kilometres (10 by 5 mi) and has a population of 4,534 (2016 census). It was named after Saint Helena of Constantinople. It is one of the most remote islands in the world and was uninhabited when discovered by the Portuguese in 1502. For centuries it was an important stopover for ships sailing to Europe from Asia and Southern Africa. Saint Helena is the United Kingdom's second-oldest overseas territory after Bermuda. It is perhaps best known for being the site Napoleon was exiled to after his final defeat in 1815.