Colony of Aden in the context of "Aden Protectorate"

South Yemen, officially the People's Democratic Republic of Yemen (PDRY), abbreviated to Democratic Yemen, was a country in South Arabia that existed in what is now southeast Yemen from 1967 until its unification with the Yemen Arab Republic in 1990. The sole communist state in the Middle East and the Arab world, it comprised the southern and eastern governorates of the present-day Republic of Yemen, including the islands of Perim, Kamaran, and the Socotra Archipelago. It bordered the Yemen Arab Republic to the northwest, Saudi Arabia to the north, Oman to the east, the Arabian Sea to the southeast, and the Gulf of Aden to the south. Its capital and largest city was Aden.

South Yemen's origins can be traced to 1874 with the creation of the British Colony of Aden and the Aden Protectorate, which consisted of two-thirds of present-day Yemen. Prior to 1937, what was to become the Colony of Aden had been governed as a part of British India, originally as the Aden Settlement subordinate to the Bombay Presidency and then as a Chief Commissioner's province. After the establishments of the Protectorate and Federation of South Arabia amidst rising Pan-Arab and anti-colonial sentiment, an armed rebellion began in 1963 that was led by the National Liberation Front (NLF) and the Front for the Liberation of Occupied South Yemen (FLOSY) against British colonial rule. The Federation and Protectorate of South Arabia were overthrown to become the People's Republic of Southern Yemen (PRSY) on 30 November 1967.

The Aden Emergency, also known as the 14 October Revolution or the Aden Insurgency, was an armed rebellion led mainly by the National Liberation Front (NLF) and the Front for the Liberation of Occupied South Yemen (FLOSY) against the British Protectorate and Federation of South Arabia. It began on 14 October 1963 when tribes from Radfan attacked British troops and ended with the proclamation of independence of the People's Republic of Southern Yemen.

The British had declared a state of emergency following the throwing of a grenade at a gathering of British officials on 10 December 1963 at RAF Khormaksar. A state of emergency was then declared in the British Crown colony of Aden and its hinterland, the Aden Protectorate. The emergency escalated in 1967, hastening the end of British rule in the territory, which had begun in 1839.

The India Office was a British government department in London established in 1858 to oversee the administration of the Provinces of India, through the British viceroy and other officials. The administered territories comprised most of the modern-day nations of the Indian Subcontinent as well as Yemen and other territories around the Indian Ocean. The India Office was headed by the Secretary of State for India, a member of the British cabinet, who was formally advised by the Council of India.

Upon the independence of India in 1947 into the new independent dominions of India and Pakistan, the India Office was closed down. Responsibility for the United Kingdom's relations with the new countries was transferred to the Commonwealth Relations Office (formerly the Dominions Office).

His (or Her) Majesty's Principal Secretary of State for India, known for short as the India secretary or the Indian secretary, was the British Cabinet minister and the political head of the India Office responsible for the governance of the British Indian Empire, including Aden, Burma and the Persian Gulf Residency. The post was created in 1858 when the East India Company's rule in Bengal ended and India, except for the Princely States, was brought under the direct administration of the government in Whitehall in London, beginning the official colonial period under the British Empire.

In 1937, the India Office was reorganised which separated Burma and Aden under a new Burma Office, but the same secretary of state headed both departments and a new title was established as His Majesty's Principal Secretary of State for India and Burma. The India Office and its secretary of state were abolished in August 1947, when the United Kingdom granted independence in the Indian Independence Act, which created two new independent dominions, India and Pakistan. Burma soon achieved independence separately in early 1948.