Investiture Controversy

The Investiture Controversy or Investiture Contest was the most significant conflict between Church and state in medieval Europe. In the 11th and 12th centuries, a series of Popes challenged the authority of European monarchies over control of appointments, or investitures, of church officials such as bishops and abbots. Although the principal conflict began in 1075 between Pope Gregory VII and Henry IV, Holy Roman Emperor, a brief but significant struggle over investiture also occurred between Henry I of England and Pope Paschal II in the years 1103 to 1107, and the issue played a minor role in the struggles between church and state in France as well. The entire controversy was finally resolved by the Concordat of Worms in 1122.

By undercutting the Imperial power established by the Salian emperors, the controversy led to nearly 50 years of civil war in Germany, and the triumph of the great dukes and abbots, until Imperial power was reestablished under the Hohenstaufen dynasty.

Read more about Investiture Controversy:  Origins, Investiture Controversy, English Investiture Controversy of 1103 To 1107, Concordat of London, 1107, Concordat of Worms and Its Significance

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    And therefore, as when there is a controversy in an account, the parties must by their own accord, set up for right Reason, the Reason of some Arbitrator, or Judge, to whose sentence, they will both stand, or their controversy must either come to blows, or be undecided, for want of a right Reason constituted by Nature; so is it also in all debates of what kind soever.
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