Nothing. The fleur-de-lis is a commonly used decorative symbol, it was used as a symbol of chastity and virtue before any families adopted it for themselves. It is mostly used as a symbol in connection with the Blessed Virgin Mary and St Joseph

The Fleur de Lis is a common symbol throughout history (I think the first images of one was found at mesopotamia). In modern history it’s common in France but also as the symbol of the city Florence. And now I’m not quiet sure, but my guess is the Medici, the ruling family of Florence had a big influence about the Fleur de lis spread around Italy.

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

Wow! TIL the Fleur de Lis is so much more than the Bourbons! Thank you all for the fantastic answers.

And look at that! Like y’all said it’s on the Medici coat of arms ( they were in Florence) Medici coat of arms

Uh oh! Here it is on the Farnese Coat of Arms as well! Although I thought their thing was bees

Interestingly but obviously linked to the Bourbons, you’ll find fleur de lys everywhere in Louisiana, even the New Orleans football team has it as a symbol