Her association with Handel can be dated to 1714, when he wrote the solo soprano role in the
Ode for the Birthday of Queen Anne for her. She joined his company early that year, making her debut in
Creso, a
pasticcio. As the year went on she sang in revivals of
Arminio and
Ernelinda (both pasticcios, possibly with music by
Nicola Haym); on several occasions new music was written for her. London audiences clearly gave her a good reception, and her career continued to prosper; she played the role of Almirena in a 1715 revival of
Rinaldo, and originated the role of Oriana in Handel's
Amadigi. In a 1717 revival of this opera Handel created a new scene for her and
Nicolini, the brilliant
castrato who had earlier originated the title role in
Rinaldo. Around 1719 it seems that an illness caused her voice to drop from that of a soprano to that of a contralto. Upon the formation of
Handel's Royal Academy of Music in 1719, Robinson was engaged on a yearly salary of £1000 and originated many new roles, most notably Zenobia (
Radamisto), Irene (
Muzio Scevola), Elmira (
Floridante), Matilda (
Ottone), Teodata (
Flavio) and, most famously of all, the pathos-filled role of Cornelia in
Giulio Cesare. She also sang in works by
Bononcini and
Ariosti, as well as a number of pasticcios. Soon after the premiere of
Giulio Cesare in February 1724 she retired from the stage. In 1722 (or possibly 1723) she had secretly married
Charles Mordaunt, 3rd Earl of Peterborough, although he did not acknowledge her status as his wife until 1735, just before his death; until then they lived separately, and society regarded her as his
mistress. Robinson seems to have come out of retirement in some capacity by 1745 as evidenced by her originating the role of Dejanira in Handel's
Hercules. ==Personal life, scandal, and life in retirement==