Saint Helena ( /ˌseɪnt həˈliːnə/ SAYNT-hə-LEE-nə), named after Saint Helena of Constantinople, is an island of volcanic origin in the South Atlantic Ocean. It is part of the British overseas territory of Saint Helena, Ascension and Tristan da Cunha which also includes Ascension Island and the islands of Tristan da Cunha. Saint Helena measures about 16 by 8 kilometres (10 by 5 mi) and has a population of 4,255 (2008 census).

The island was uninhabited when discovered by the Portuguese in 1502. It is one of the most isolated islands in the world. For centuries, it was an important stopover for ships sailing to Europe from Asia and South Africa. The British also used the island as a place of exile, most notably for Napoleon I, Dinuzulu kaCetshwayo and more than 5,000 Boer prisoners. Saint Helena is Britain's second oldest remaining colony (now termed overseas territory), after Bermuda.

Most historical accounts state that the island was discovered on 21 May 1502 by the Galician navigator João da Nova sailing at the service of the Portuguese Crown, and that he named it "Santa Helena" after Helena of Constantinople. Another theory holds that the island found by De Nova was actually Tristan da Cunha 2,430 kilometres (1,510 mi) to its south, and that Saint Helena was discovered by some of the ships attached to the squadron of Estêvão da Gama expedition on 30 July 1503 (as reported in the account of clerk Thomé Lopes).

Marco Polo (ⁱ/ˈmɑrkoʊ ˈpoʊloʊ/; Italian pronunciation: [ˈmarko ˈpɔːlo]; c. 1254 – January 9, 1324) was a Venetian merchant traveler from the Venetian Republic whose travels are recorded in Il Milione, a book which did much to introduce Europeans to Central Asia and China. He learned about trading whilst his father and uncle, Niccolò and Maffeo, travelled through Asia and apparently met Kublai Khan. In 1269, they returned to Venice to meet Marco for the first time. The three of them embarked on an epic journey to Asia, returning after 24 years to find Venice at war with Genoa; Marco was imprisoned, and dictated his stories to a cellmate. He was released in 1299, became a wealthy merchant, married and had three children. He died in 1324, and was buried in San Lorenzo.

Their pioneering journey inspired Christopher Columbus and others. Marco Polo's other legacies include Venice Marco Polo Airport, the Marco Polo sheep, and several books and films. He also had an influence on European cartography, leading to the introduction of the Fra Mauro map.