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Why did Pope Pius VII’s relationship with Napoleon deteriorate?

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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 relationship between Pope Pius VII and Napoleon Bonaparte deteriorated primarily due to Napoleon’s efforts to restrict papal authority and his aggressive expansion into the Papal States.21

While the Concordat of 1801 initially established a modus vivendi between the church and the French state, tensions escalated when Napoleon unilaterally appended the Organic Articles to the agreement. These provisions forbade the exercise of papal jurisdiction in France without government permission, effectively undermining the Pope's authority.231

The conflict intensified further when:
* Failed Negotiations: Pius VII attempted to have these articles modified during his 1804 visit to Paris for Napoleon’s coronation, but he was unsuccessful.14
* Territorial Annexation: In 1808, French troops occupied Rome, and in 1809, Napoleon formally annexed the Papal States to the French Empire.14
* Imprisonment: In response to the annexation, Pius VII excommunicated the invaders, leading to his arrest and long-term imprisonment by Napoleon.214

Although Napoleon later forced the Pope to sign a new concordat in 1813 while in custody, Pius VII repudiated the document shortly thereafter, maintaining his resistance until Napoleon's final defeat.21