From A Wiki of Ice and Fire
|Alias||Florian the Fool|
|Book(s)|| The Hedge Knight (Mentioned)|
A Game of Thrones (Mentioned)
A Clash of Kings (Mentioned)
A Storm of Swords (Mentioned)
A Feast for Crows (Mentioned)
A Dance with Dragons (Mentioned)
Florian, better known as Florian the Fool, is the main character of a tale about falling in love with a maiden named Jonquil.
A Clash of Kings
There is an as yet untitled famous song about Florian and Jonquil. Sansa Stark knows it. She offers to sing the song to Sandor Clegane but he declines it at first. During the Battle of the Blackwater he comes for the song but Sansa sings him the Mother’s instead.
A Feast for Crows
Early on in her quest to find Sansa Stark, Brienne remembers that when she was a child her nurse had filled her ears with tales of valour, regaling her with the noble exploits of many champions, among them Florian the Fool. 
A Dance with Dragons
|“||”You think Daenerys will execute me and pardon you, but the reverse is just as likely. Maybe you should hop up on that pig, Ser Jorah. Put on a suit of iron motley, like Florian the –”||”|
Ser Jorah cracks Tyrion's head around and knocks him sideways before he can finish.
|“||"Sweet lady, I would be your Florian." ||”|
|“||"Florian and Jonquil? A fool and his cunt. Spare me." ||”|
|“||“I’ll have that song. Florian and Jonquil, you said.”||”|