William Daniel Conybeare FRS (7 June 178712 August 1857), dean of Llandaff, was an English geologist, palaeontologist and clergyman. He is probably best known for his ground-breaking work on fossils and excavation in the 1820s, including important papers for the Geological Society of London on ichthyosaur anatomy and the first published scientific description of a plesiosaur. Life and career Childhood and education He was a grandson of John Conybeare, bishop of Bristol (1692–1755), a notable preacher and divine, and son of Dr William Conybeare, rector of St Botolph-without-Bishopsgate. Born in London, he was educated there at Westminster School, then went in 1805 to Christ Church, Oxford, where in 1808 he took his degree of BA, with a first in classics and second in mathematics, and proceeded to MA three years later. Early career Having entered holy orders he became in 1814 curate of Wardington, near Banbury, and he accepted also a lectureship at Brislington near Bristol. During this period he was one of the founders of the Bristol Philosophical Institution (1822). He was rector of Sully in Glamorganshire from 1823 to 1836, and vicar of Axminster from 1836 to 1844. He was appointed Bampton lecturer in 1839, called and later published in a book as An Analytical Examination into the Character, Value, and Just Application of the Writings of the Christian Fathers During the Ante Nicene Period. He was instituted to the deanery of Llandaff in 1845. Geology Attracted to the study of geology by the lectures of Dr John Kidd he pursued the subject with ardour. As soon as he had left college he made extended journeys in Britain and on the continent, and he became one of the early members of The Geological Society. Both Buckland and Sedgwick acknowledged their indebtedness to him for instruction received when they first began to devote attention to geology. He contributed geological memoirs to the Transactions of the Geological Society, the Annals of Philosophy, and the Philosophical Magazine. In 1821, in collaboration with Henry De la Beche he distinguished himself by describing, from fragmentary remains, the saurian Plesiosaurus in a paper for the Geological that also contained an important description and analysis of all that had been learned to that point about the anatomy of ichthyosaurs including the fact that there had been at least three different species. His predictions about the plesiosaur were proved correct by the discovery of a nearly