Sarah Siddons was an acclaimed British actress who lived from 1755 to 1831. She was known for her powerful and emotional performances on the stage, particularly in tragic roles. Siddons was considered one of the greatest tragediennes of her time and had a significant impact on the development of acting as a profession. Her performances were highly regarded and she became a prominent figure in the theater world, earning her a lasting legacy as one of the most influential actresses of the 18th century.