Closely related to Triceratops, Regaliceratops was named for its plated frill, which its describers thought looked somewhat like a crown. In 2005, geologist Peter Hews discovered a skull at the Oldman River in Alberta. The fossil was secured by a team of the Royal Tyrrell Museum. The specimen was given the nickname "Hellboy" for its horns and the difficulty of removing it from the matrix.[3] Regaliceratops was about five metres long, with an estimated weight of 1.5 tonnes.