LIBBER, SUSANNAH MARIA (1714-1766), wife of T. Cibber, was an actress of distinction. She was the daughter of a Covent Garden upholsterer, and sister of Dr. Arne (1710-78) the composer. Mrs. Cibber had a beautiful voice and began her career in opera. She was the original Galatea in Handel's Acis and Gala tea, and the contralto arias in the Messiah are said to have been written for her. She played Zarah in Aaron Hill's version of Vol taire's Zaire in 1736, and it was as a tragic actress, not as a singer, that her greatest triumphs were won. From Colley Cibber she learned a sing-song method of declamation. Her mannerisms, how ever, did not obscure her real genius, and she freed herself from them entirely when she began to act with Garrick, with whom she was associated at Drury Lane from 1753. She died on Jan. 30, 1766. She married Theophilus Cibber in 1734, but soon separated from him. Appreciations of Mrs. Cibber's fine acting are to be found in many contemporary writers, one of the most discrimi nating being in the Rosciad of Charles Churchill.