William, Viscount Brouncker, P. R. S. (1620-1684)

Abstract

The lack of a definitive study of the life of Lord Brouncker, a spiteful remark of Pepys so often quoted against him (1), and possible confusion with his less reputable brother Henry (2), all combine to prompt an intriguing question. Why was he chosen as the first President of the Royal Society rather than John Wilkins, John Wallis, Robert Boyle or Sir Robert Moray? The wisdom of the choice was proved by the devoted and able service he gave to that high office during the infant years of the Society. William, second Viscount Brouncker of Castle Lyons, in the Irish peerage, was the elder son of Sir William Brouncker, gentleman of the privy chamber to Charles I, and vice-chamberlain to his son, Charles, Prince of Wales. ‘This loyal knight’ Wood records in his Athena Oxonienses ‘who was the son of Sir Henry Bruncker, President of Mounster in Ireland , by Anne, his wife, sister of Henry, Lord Morley, was created Viscount of Castle Lyon in the said kingdom 12 September 1645, and dying in Wadham College, in the middle of November following, was buried on the 20th of the said month.’ We know little of Brouncker’s early life, even the date of his birth, 1620, is conjectural. He was sent to Oxford at the age of sixteen, where he quickly made himself proficient in several languages. He was probably intended to follow the profession of medicine, as in 1647 he was awarded the degree of Doctor of Physick at Oxford, but his inclination led him to the study of mathematics, for which he evidently had a flair. He soon began to correspond with distinguished mathematicians, notably John Wallis, and it was not long before his reputation as a mathematician was recognized both at home and abroad.