The national flag of Peru, officially named the Bandera Nacional and often referred to as The Bicolour, is a vertical triband with red outer bands and a single white middle band, as defined by Article 49 of the Constitution of the Republic of Peru. The current flag was adopted by the Congress of Peru on 25 February 1825, and modified in 1950. Depending on its use, it may be defaced with different emblems, and has different names. Flag Day in Peru is celebrated on 7 June, the anniversary of the Battle of Arica.