Spain flag

 Which

 The flag of Spain, as it is defined in the Spanish Constitution of 1978, consists of three horizontal stripes: red, yellow and red; the yellow stripe being twice the size of each red stripe. Traditionally, the middle stripe was defined by the more archaic term of gualda, and hence the popular name la Rojigualda.The origin of the current flag of Spain is the naval ensign of 1785, Pabellón de la Marina de Guerra under Charles III of Spain. It was chosen by Charles III himself among 12 different flags designed by Antonio Valdés y Bazán (all proposed flags were presented in a drawing which is in the Naval Museum of Madrid).