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Why was the Donation of Pippin important to papal temporal power?

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Side-by-side maps of central Italy showing the changing boundaries of the Papal States. The left map highlights the Papal States after the Treaty of Vienna in 1815 in green, showing their greatest extent. The right map shows the Papal States' reduced territory just before absorption into Italy, with orange marking areas annexed in 1860 and yellow showing the final area annexed in 1870, centered ar — Papal States The Papal States in 1815 (left) and at their annexation by Italy in 1870.

The Donation of Pippin was a pivotal event in the development of the Papal States and the establishment of papal temporal power. Its importance lies in several key factors:

Securing Protection: In the mid-8th century, the papacy faced existential threats from the Lombards, who were encroaching on Roman territories. Because the Byzantine Empire could no longer provide effective protection, the pope turned to the Carolingian king Pippin III for military support.1
Territorial Grant: Through his promise and subsequent military campaigns in 755 and 756, Pippin defeated the Lombard king Aistulf and granted the papacy rights over significant territories in central Italy, including the Roman duchy and the exarchate of Ravenna. This effectively transferred control of these lands to the pope, providing a physical foundation for the church's temporal authority.1
Solidifying Alliances: The Donation formalized a crucial alliance between the papacy and the Frankish monarchy. This relationship was further strengthened when the pope anointed Pippin and his sons, Charlemagne and Carloman, cementing a political partnership that shifted the papacy's orientation away from Byzantium and toward the Western kingdoms.12