Richard III, Coeur de Lion

IIRC, Richard I is buried in Rouen.

No, he’s buried at Fontevrault.

http://www.hfac.uh.edu/gbrown/philosophers/leibniz/BritannicaPages/KingRichard-I/KingRichard-IGif.html

Further investigation shows that his heart was buried in Rouen, and the rest of him in Fontrevault. There is a tomb effigy in both places. The heart has since been moved to the municipal museum in Rouen.

You’re right about the heart. Here’s a picture of that monument.

http://www.chronicus.com/moyenage/bios/richcdl.htm

Could you (or whoever told you this rumor) be thinking about King George I?