Who can declare someone king or queen?

A king or queen is typically declared by a governing authority, such as a monarch's predecessor, a ruling council, or a national assembly, depending on the country's traditions and laws. In hereditary monarchies, succession usually follows family lineage, while in elective monarchies, a specific group may vote to select the monarch. Religious leaders or ceremonies may also play a role in the formal declaration and anointing of a king or queen. Ultimately, the legitimacy of the declaration often relies on historical precedents and the acceptance of the populace.