His son , the fifth Earl , was Lord - Lieutenant of County Longford from 1887 to 1915 .
He was a Conservative politician and served under the Earl of Derby and Benjamin Disraeli as Under - Secretary of State for War from 1866 to 1868 .
politician 's son , the fifth politician , was Lord - Lieutenant of County Longford from 1887 to 1915 .
He was a Conservative politician and served under the Earl of Derby and Benjamin Disraeli as Under - Secretary of State for War from 1866 to 1868 .