Augusta Catherine, Countess of Euston, was born on December 24, 1740. She was the daughter of John FitzRoy, 4th Duke of Grafton and Augusta, Duchess of Grafton. Augusta married Henry FitzRoy, 5th Duke of Grafton in 1763, becoming the Countess of Euston. Throughout her life, Augusta was known for her involvement in social and charitable activities. She was a prominent figure in the British aristocracy during the 18th century and played a role in the cultural and political life of her time. Augusta passed away on March 24, 1813.