Quite a few Popes had the Fleur-de-Lis in their Coat of Arms, maybe you saw those?

For example:

• XIII^th century: Urban IV, Innocent V, Nicholas IV
• XVI^th century: Paul III
• XVII^th century: Innocent X
• XIX^th century: Leo XIII

See here: https://en.wikipedia.org/wiki/Papal_coats_of_arms