William Buckland DD FRS (12 March 1784 – 14 August 1856) was an English theologian who became Dean of Westminster. He was also a geologist and palaeontologist, writing the first full account of a fossil dinosaur, which he named Megalosaurus. His work proving that Kirkdale Cave had been a prehistoric hyena den, for which he was awarded the Copley Medal, was praised as an example of how scientific analysis could reconstruct events from the distant past. He was a pioneer in the use of fossilised faeces, for which he coined the term coprolites, to reconstruct ancient ecosystems.