Ceylon adopts a new constitution, becoming a republic and changing its name to Sri Lanka.

The Sri Lankan Constitution of 1972 was a constitution of Sri Lanka, replaced by the 1978 constitution currently in force. It was Sri Lanka's first republican constitution, and its second since independence in 1948. The constitution changed the country's name from Ceylon to Sri Lanka, and established it as an independent republic. The country was officially designated as the "Republic of Sri Lanka," leading to the constitution being known as the 1972 Republican Constitution. The constitution was promulgated on 22 May 1972.

A republic, based on the Latin phrase res publica, is a state in which political power rests with the public (people), typically through their representatives—in contrast to a monarchy. Although a republic is most often a single sovereign state, subnational state entities that have governments that are republican in nature may be referred to as republics.

Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka, also known historically as Ceylon, is an island country in South Asia. It lies in the Indian Ocean, southwest of the Bay of Bengal, separated from the Indian peninsula by the Gulf of Mannar and the Palk Strait. It shares a maritime border with the Maldives in the southwest, India in the northwest, Andaman and The Nicobar Islands in the northwest, and Myanmar through the Bay of Bengal. Sri Jayawardenepura Kotte is the legislative capital of Sri Lanka, while the largest city, Colombo, is the administrative and judicial capital which is the nation's political, financial and cultural centre. Kandy is the second-largest urban area and also the capital of the last native kingdom of Sri Lanka. The most spoken language Sinhala, is spoken by the majority of the population. Tamil is also spoken by approximately five million people, making it the second most-spoken language in Sri Lanka.