Lisbon is ane o the auldest ceeties in the warld. Julius Caesar made it a municipium cawed Felicitas Julia, addin tae the name Olissipo. Ruled bi a series o Germanic tribes frae the fift century, it wis captured bi the Moors in the aicht century. In 1147, the Crusaders unner Afonso Henriques reconquered the ceety for the Christians an syne then it haes been a major poleetical, economic, an cultural centre o Portugal. Unlike maist caipital ceeties, Lisbon's status as the caipital o Portugal haes niver been grantit or confirmed offeecially – bi statute or in written form. Its position as the caipital haes formed through constitutional convention, makin its position as de facto caipital a pairt o the Constitution o Portugal.