An elective monarchy is a monarchy ruled by an elected monarch, in contrast to a hereditary monarchy in which the office is automatically passed down as a family inheritance. The manner of election, the nature of candidate qualifications, and the electors vary from case to case. Historically, it was common for elective monarchies to transform into hereditary ones over time or for hereditary ones to acquire at least occasional elective aspects.
Many kingdoms were officially elective historically, though the candidates were typically only from the family of the deceased monarch. Eventually, however, most elected monarchies introduced hereditary succession, guaranteeing that the title and office stayed within the royal family and specifying, more or less precisely, the order of succession.
Today, almost all monarchies are hereditary monarchies in which the monarchs come from one royal family with the office of sovereign being passed from one family member to another upon the death or abdication of the incumbent.
The kings of Macedon and of Epirus were elected by the army, which was similar in composition to the Ecclesia of the Demos, the assembly of all free Athenian citizens. Military service often was linked with citizenship among the male members of the royal house.
In the ancient Roman Kingdom the kings were elected by the Roman assemblies. Once the Roman kings were overthrown, there remained an absolute prohibition for royal establishment in the Roman constitution, a prohibition which formally remained in place during imperial times, both classical Roman and Byzantine. In practice, however, Imperial Rome was a monarchy. During the Principate (27 BCE to 284 CE), which was the foundational stage of Roman imperialism, Roman monarchs would often take care to disguise their de facto position with the de jure apparatus of republicanism. This was particularly the case for Augustus, the first Emperor, who established the Principate. Whilst given many titles (including "Augustus", i.e.