The national flag of the Portuguese Republic, often referred to as the Portuguese flag, consists of a rectangular bicolour with a field divided into green on the hoist, and red on the fly. The version without laurels of the country’s national coat of arms stands in the middle of the Portuguese armillary sphere and shield, centered over the colour boundary at equal distance. The flag was announced in 1910, following the 5 October 1910 revolution, inspired by the colours of the Republican Party and the design of radical conspiratorial society the Carbonária.
Its presentation was done on 1 December 1910, after the downfall of the constitutional monarchy on 5 October 1910. However, the official decree approving this flag as the official flag was published on 30 June 1911.