Career
He was made a Privy Councillor in 1776 by King George III. He inherited his father"s estate of Markree Castle near Collooney. Joshua Edward became deranged by 1806, and management of Markree passed to Joshua"s younger son Edward Synge Cooper (1762–1830), whose son Edward Joshua Cooper inherited Markree in 1837. His great-grandson Edward Joshua Cooper (1798–1863), also an Member of Parliament, was a noted astronomer who built Markree Observatory in the 1830s.
