Proceratosaurus was a primitive coelurosaurian theropod that lived in England, Europe in the Early Jurassic Period. It looked somewhat similar to the later Ceratosaurus, for which it is named after, but only due to it also having a hornlike crest.
Despite its name, it is not related to Ceratosaurus, but to the later Tyrannosaurus. Overall, Proceratosaurus was a much more gracile and delicate animal. Recent research has speculated with good supporting evidence that Proceratosaurus is the earliest tyrannosauroid.