Lisbon
Lisbon is one of the oldest cities in the world, and one of the oldest in Western Europe, predating other modern European capitals such as London, Paris, and Rome by centuries. Julius Caesar made it a municipium called "Felicitas Julia", adding to the name "Olissipo". Ruled by a series of Germanic tribes from the 5th century, it was captured by the Moors in the 8th century. In 1147, the Crusaders under Afonso Henriques reconquered the city and since then it has been a major political, economic and cultural centre of Portugal. Unlike most capital cities, Lisbon's status as the capital of Portugal has never been granted or confirmed officially – by statute or in written form. Its position as the capital has formed through constitutional convention, making its position as "de facto" capital a part of the Constitution of Portugal.
António Costa
António Costa resigned all government offices in May 2007 to become his party's candidate for the municipality of Lisbon, Portugal's capital city. He was elected as Lisbon's mayor on 15 July 2007 and reelected in 2009 and 2013, with a bigger majority each time. In April 2015 he resigned his duties as a mayor, while he was already the Secretary General of the Socialist Party and the party's candidate for Prime Minister, so that he could prepare his campaign for the October 2015 general elections.