Saint Helena () is a British overseas territory located in the South Atlantic Ocean. It is a remote volcanic tropical island west of the coast of south-western Africa, and east of Rio de Janeiro in South America. It is one of three constituent parts of the British Overseas Territory of Saint Helena, Ascension and Tristan da Cunha. Saint Helena measures about and has a population of 4,439 per the 2021 census. It was named after Helena, mother of Constantine I. It is one of the most remote islands in the world and was uninhabited when discovered by the Portuguese enroute to the Indian subcontinent in 1502. For about four centuries the island was an important stopover for ships from Europe to Asia and back, while sailing around the African continent, until the opening of the Suez canal. St Helena is the United Kingdom's second-oldest overseas territory after Bermuda. Saint Helena is known for being the site of Napoleon's second exile, following his final defeat in 1815. History Early history (1502–1658) By long tradition the island was sighted on 21 May 1502 by the four ships of the 3rd Portuguese Armada commanded by Galician navigator João da Nova during the return voyage to Lisbon, and that he named it Santa Helena after Saint Helena of Constantinople. This tradition has been reviewed by a 2022 paper which concluded the Portuguese chronicles published at least 50 years later, are the sole primary source to the discovery. Although contradictory in describing other events, these chronicles almost unanimously claim João da Nova found St Helena sometime in 1502, although none quote the precise date. However, there are several reasons for doubting da Nova made this discovery. First, given that da Nova either returned on 11 September or 13 September 1502 it is usually assumed the Cantino planisphere completed by the following November includes his discovery of Ascension Island (shown as an archipelago with one of six islands marked as “ilha achada e chamada Ascenssam”), yet this map fails to show St Helena. Second, when a section of the Fourth Armada under the command of Estêvão da Gama sighted and landed at St Helena the following year on 30 July 1503 its scrivener Thomé Lopes regarded it as an unknown island yet named Ascension as one of five reference points to the new island’s location. On 12 July 1503, nearly three weeks before reaching St Helena,