The Pope being present was significant for Napoleon and confirming his
power was to sanctify the ceremony and gain prestige in the international
sphere.
Pope Pius VII was brought from Italy to France to honor the occasion. He
sanctified the occasion before Napoleon was crowned the leader.
Napoleon wanted to make a strong statement by doing so.
This made Napoleon have an advantage in electing bishops and was able
to control the financial aspect of churches due to the perceived relationship
with the Pope.
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