Laurence Parsons, 4th earl of Rosse (1840–1908)

Astronomer and engineer. Son of William Parsons, third earl of Rosse. Graduated from Trinity College, Dublin, 1864. Succeeded to the title and estates in 1867. High sheriff of King’s county, Ireland, 1867; representative peer for Ireland, 1868. Worked in particular on the radiant heat of the moon. FRS 1867.