Roman Emperor. Desaguliers also presided when Frederick, Prince of Wales, became a Freemason in 1731, and he additionally became a chaplain to the Prince. Family On 14 October 1712 John Theophilus Desaguliers married Joanna Pudsey, daughter of William and Anne Pudsey of Kidlington, near Oxford. For most of their married life the couple lived at Channel Row, Westminster where Desaguliers gave the majority of his lectures. When forced to leave due to work on Westminster Bridge they separated and John Theophilus took lodgings at the Bedford Coffee House in Covent Garden and carried on his lectures there. The Desaguliers had four sons and three daughters, for most of whom they acquired aristocratic godparents, but only two children survived beyond infancy: John Theophilus jnr (1718–1751) graduated from Oxford, became a clergyman, and died childless, while Thomas (1721–1780) had a distinguished military career in the Royal Artillery, rising to the rank of General. He became chief firemaster at the Arsenal, Woolwich, and seems to have been the first to be employed by the English army to apply scientific principles to the production of cannon and the powers of gunnery, for which he was elected a Fellow of the Royal Society. It was Thomas Desaguliers who in part designed and supervised the fireworks for the first performance of Handel's Music for the Royal Fireworks in Green Park. He later became an equerry to King George III. Final years John Theophilus Desaguliers had long suffered from gout. He died at his lodgings in the Bedford Coffee House on 29 February 1744 and was buried on 6 March 1744 in a prestigious location within the Savoy Chapel in London. The chapel was probably chosen for its Huguenot associations and in memory of Desaguliers's origins. The press announcements of his death referred to him as 'a gentleman universally known and esteemed'. In his will Desaguliers left his estate to his elder son who organised the publication of the second edition of his "Course of Experimental Philosophy". Although never a wealthy man, he did not die in poverty as suggested by the oft-quoted but inaccurate lines of the poet James Cawthorn: How poor neglected Desaguiliers fell! How he who taught two gracious kings to view All Boyle ennobled, and all Bacon knew, Died in a cell, without a friend to save, Without a guinea, and without a grave. These are taken from a long poem entitled "The