The title Earl Brooke was created in the Peerage of Great Britain in 1746 for Francis Greville, who already held the title Baron Brooke, of Beauchamp's Court in the County of Warwick (created 1621). In 1759, the 1st Earl Brooke was created Earl of Warwick, and since then the Earls Brooke have been known by that title rather than the more senior Earldom of Brooke. This creation was the fourth creation of the Earldom of Warwick; earlier that year, the third creation ended in extinction. The Earldom of Warwick and Warwick Castle were therefore united under one holder for the first time in centuries.
The title Earl of Warwick is one of the oldest English earldoms.
It was traditionally associated with possession of Warwick Castle, and when the 11th Earl entailed the castle to his heirs male, he probably intended to entail the earldom as well.
At the death of the eighth Rich Earl, the title became extinct, and was granted to Francis Greville, 1st EarlBrooke, thus uniting again the title and castle.