Despite being born into Astorian royalty, Prince Ricard wandered the lands in a fateful ill-conceived journey. He became undead and disappeared up north, winding up in Lordran. Already hollowed, Undead Prince Ricard can be encountered in Sen's Fortress.
Ricard's Rapier - 100% drop
- Lightning-based attacks
Always keep him above you, but still in height for attack (best with some forward attacking weapon like a spear) and just smash. He won't be able to actually hit you if you keep your altitude differences. A weapon with lightning-based damage will make this fight quick and easy.
There is a glitch with backstabbing him when your back is against one of the ledges that are near him, you can sometimes be considered as 'falling' and after the animation ends, you'll instantly die. If he dies from said backstab and you die as well, you will not receive Ricard's Rapier. (Video)
A similar bug can be found in parrying and riposting him (with hornet ring) The game appears to register that it is your character that got riposted (without animation), resulting in you character taking as much damage as was inflicted.