 The Portuguese Riviera originated when King Luís I of Portugal ordered a royal residence to be constructed in Cascais Citadel, starting the tradition of Cascais being the Portuguese royal family's Summer residence, which lasted from 1870 to 1908, transforming the seaside village into a cosmopolitan address.Thanks to King Luís I, the citadel was equipped with the country's first electric lights in 1878.Cascais also benefited with the construction of better roads to Lisbon and Sintra, a casino, a bullfight ring, a sports club, and improvements to basic infrastructure for the population.