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 .
He died unmarried and was succeeded by his younger brother , the fourth Earl .
Earl was a Conservative Earl and served under the Earl of Derby and Benjamin Disraeli as Under - Secretary of State for War from 1866 to 1868 .
He died unmarried and was succeeded by his younger brother , the fourth Earl .