A hereditary monarchy is a form of government and succession of power in which the throne passes from one member of a ruling family to another member of the same family. A series of rulers from the same family would constitute a dynasty. It is historically the most common type of monarchy and remains the dominant form in extant monarchies. It has the advantages of continuity of the concentration of power and wealth and predictability of who one can expect to control the means of governance and patronage. Provided that a monarch is competent, not oppressive, and maintains an appropriate dignity, it might also offer the stabilizing factors of popular affection for and loyalty to a ruling family. The adjudication of what constitutes oppressive, dignified and popular tends to remain in the purview of the monarch. A major disadvantage of hereditary monarchy arises when the heir apparent may be physically or temperamentally unfit to rule. Other disadvantages include the inability of a people to choose their head of state, the ossified distribution of wealth and power across a broad spectrum of society, and the continuation of outmoded religious and social-economic structures mainly for the benefit of monarchs, their families, and supporters.
Emperor Naruhito is the hereditary monarch of Japan. The Japanese monarchy is the oldest continuous hereditary monarchy in the world.
A monarchy is a form of government in which a person, the monarch, is head of state for life or until abdication. The political legitimacy and authority of the monarch may vary from restricted and largely symbolic, to fully autocratic, and can span across executive, legislative, and judicial domains.
The Weld-Blundell Prism, inscribed with the Sumerian King List
King George III of the United Kingdom, portrait by Allan Ramsay, 1762
King Salman of Saudi Arabia is an absolute monarch.
Postcard of ruling monarchs, taken in 1908, between February (accession of King Manuel II of Portugal) and November (death of the Guangxu Emperor)