Flag of Spain
|Design||A horizontal tricolour of red, yellow (double width) and red; charged with the Spanish coat of arms off-centred toward the hoist. |
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 projected flags were presented in a drawing which is in the Naval Museum of Madrid). The flag remained marine for much of the next 50 years, flying over coastal fortresses, marine barracks and other naval property. During the Peninsular War the flag could also be found on marine regiments fighting inland. Not until 1820 was the first Spanish land unit (The La Princesa Regiment) provided with one and it was not until 1843 that Queen Isabella II of Spain would make the flag official.
Throughout the 19th and 20th centuries, the color scheme of the flag remained intact, with the exception of the Second Republic period (1931–1939); the only changes centered on the coat of arms. 
The red and yellow colors are related to those of the oldest Spanish kingdoms: Aragon, Castile, Leon, and Navarre.
The coat of arms is quartered to display the emblems of the traditional kingdoms of Spain (clockwise from upper left, Castile, Leon, Navarre, and Aragon) while Granada is represented by the stylized pomegranate at the bottom of the shield; the arms are framed by two columns representing the Pillars of Hercules, which are the two promontories (Gibraltar and Ceuta) on either side of the eastern end of the Strait of Gibraltar; the red scroll across the two columns bears the imperial motto of "Plus Ultra" (further beyond) referring to Spanish lands beyond Europe.