An electoral college is a set of electors who are selected to elect a candidate to particular offices. Often these represent different organizations, political parties or entities, with each organization, political party or entity represented by a particular number of electors or with votes weighted in a particular way.
Early Germanic law stated that the German king led only with the support of his nobles. Thus, Pelagius needed to be elected by his Visigothic nobles before becoming king of Asturias, and so did Pepin the Short by Frankish nobles in order to become the first Carolingian king. While most other Germanic nations had developed a strictly hereditary system by the end of the first millennium, the Holy Roman Empire did not, and the King of the Romans, who would become, by papal coronation, Holy Roman Emperor or at least Emperor-elect, was elected by the college of prince-electors from the late Middle Ages until 1806 (the last election took place in 1792).
In the Church, both the clergy and laity elected the bishop or presiding presbyter. However, for various reasons, such as a desire to reduce the influence of the state or the laity in ecclesiastical matters, electoral power became restricted to the clergy and, in the case of the Church in the West, exclusively to a college of the canons of the cathedral church. In the pope's case, the system of people and clergy was eventually replaced by a college of the important clergy of Rome, which eventually became known as the College of Cardinals. Since 1059, it has had exclusive authority over papal selection.
In the 19th century and beyond, it was usual in many countries that voters did not directly vote the members of parliament. In Prussia for example, in 1849–1918 the voters were Urwähler (original voters), appointing with their vote a Wahlmann (elector). The group of electors in a district elected the deputy for the Prussian House of Representatives. Such indirect suffrage was a means to steer the voting, to make sure that the electors were "able" persons.