(February 12,1871, Edinburgh - July 1918, England.) was an artist, best known for being the wife of artist William Nicholson and mother of artists Ben Nicholson and Nancy Nicholson and the architect Christopher 'Kit' Nicholson. Mabel was the daughter of David Pryde, Headmaster of Edinburgh Ladies College 1870-1891, and Barbara Lauder, whose father William was a brother of the famous Scottish artists Robert Scott Lauder and James Eckford Lauder. Mabel had one brother, the artist James Pryde. As children they lived at 10 Fettes Row, a north-facing Edinburgh house. Pryde trained at the Bushey School of Art under the tutilage of Hubert von Herkomer. Here she met fellow student William Nicholson whom she married in 1893. She introduced Nicholson to her brother James and all three moved to Eight Bells, Denham, Buckinghamshire, where Nicholson and James Pryde would collaborate on the famous series of lithographic posters they disseminated under the pseudonym J. & W. Beggerstaff. Pryde and Nicholson had four children - Ben (1894-1982); Anthony (1897-1918) who was killed in action during the First World War; Annie Mary "Nancy" (1899-1978), and Christopher "Kit" (1904-1948). In July 1918 Pryde died from influenza in during the 1918 flu pandemic and was survived by her husband.