Countess Rose Elizabeth Fitzgerald Kennedy was an American philanthropist and socialite. She was deeply embedded in the "lace curtain" Irish Catholic community in Boston, where her father was mayor. She was the wife of businessman and investor Joseph P. Kennedy Sr., who was United States Ambassador to the Court of St James's. Their nine children included President John F. Kennedy, Senator Robert F. Kennedy, and longtime Senator Ted Kennedy. She was the sixth American woman to be granted the title of Countess by the Vatican.

https://en.wikipedia.org/wiki/Rose_Kennedy