On 11 Dec 1661 Roger Palmer 1st Earl Castlemaine (age 27) was created 1st Earl Castlemaine, 1st Baron Limerick by King Charles II of England Scotland and Ireland (age 31) in gratitude for allowing his wife Barbara Villiers 1st Duchess of Cleveland (age 21) to become the King's mistress. Barbara Villiers 1st Duchess of Cleveland (age 21) by marriage Countess Castlemaine.

Before 1670 Charles Fitzroy 1st Duke Southampton 2nd Duke Cleveland (age 7) was created 1st Baron Limerick.