“ Augustus Henry Fitzroy, 3rd duke of Grafton (1735–1811) , one of the leading politicians of his time, was the grandson of the 2nd duke, and was educated at Westminster and Cambridge. He first became known in politics as an opponent of Lord Bute; in 1765 he was secretary of state under the marquis of Rockingham; but he retired next year, and Pitt (becoming earl of Chatham) formed a ministry in which Grafton was first lord of the treasury (1766) but only nominally prime minister. ”

“ Besides his successor, the 4th duke (1760–1844) , and numerous other children, he was the father of General Lord Charles Fitzroy (1764–1829) , whose sons Sir Charles Fitzroy (1798–1858) , governor of New South Wales, and Robert Fitzroy (q.v.) , the hydrographer, were notable men. The 4th duke’s son, who succeeded as 5th duke, was father of the 6th and 7th dukes. ”