The national flag of Indonesia, which is known as Sang Saka Merah-Putih (The Sacred Red-and-White) or Bendera Merah-Putih (The Red-and-White Flag) or simply Merah-Putih (The Red and White) in Indonesian is based on the banner of the 13th century Majapahit Empire in East Java. The flag itself was introduced and hoisted in public at the Indonesian Independence Day ceremony, on 17 August 1945. The design of the flag has remained the same ever since.
Proclamation of Indonesian Independence: PROCLAMATION WE THE PEOPLE OF INDONESIA HEREBY DECLARE THE INDEPENDENCE OF INDONESIA. MATTERS WHICH CONCERN THE TRANSFER OF POWER AND OTHER THINGS WILL BE EXECUTED BY CAREFUL MEANS AND IN THE SHORTEST POSSIBLE TIME. DJAKARTA, 17 AUGUST 1945 IN THE NAME OF THE PEOPLE OF INDONESIA SOEKARNO—HATTA