Acrostic

The story involves a princess, a fierce dragon and a brave horseman.
He was George, patron saint of England and Catalonia amongst others.
Every year we celebrate his deed on the 23rd of April.

Long time ago an enormous creature asked for offerings in a realm.
Eventually, the princess was going to be eaten by the dragon.
George came on a white horse, with a shield and a sword.
Evading the fire he slew the dragon and rescued the princess.
Nobody ever knew anything about him.
Drops of blood became rosebushes.