The oldest monarchy in the world is that of

The Imperial House of Japan is recognized as the world’s oldest continuous hereditary monarchy, with traditions and institutional continuity stretching back well over two millennia [4]. By contrast, Nepal’s monarchy was abolished in 2008, ending its continuous royal line as a state institution and making it ineligible as the oldest living monarchy [1]. Saudi Arabia’s modern Kingdom is an example of an absolute monarchy but is a relatively recent formation under the House of Saud and does not claim millennia of continuous rule [2]. The British monarchy, though ancient in European terms (often dated to c. 871 or 1066 AD), is far younger than Japan’s imperial tradition [3].

Sources

1. [4] https://www.fao.org/4/t0510e/T0510E02.htm
2. [1] Contemporary World Politics, Textbook in political science for Class XII (NCERT 2025 ed.) > Chapter 3: Contemporary South Asia > Monarchy and Democracy in Nepal > p. 36
3. [2] Exploring Society:India and Beyond ,Social Science-Class VII . NCERT(Revised ed 2025) > Chapter 9: From the Rulers to the Ruled: Types of Governments > a. Absolute monarchy > p. 201
4. [3] https://www.oldest.org/politics/monarchy/