In 1851 William KNOWLES is at a place called Lambolds, in Empshott, with his wife and family. He is an ag lab and also the Parish Clerk. Lambolds is next door to the Vicarage. One of William's daughters is Mary aged 20 born Empshott. There is also a grand daughter Mary Ann KNOWLES in the same household aged 1 or 4 m, born Empshott, so it looks like Mary KNOWLES was not married to George until after 1851, probably closer to 1856.
1871
West Harting, Harting
Geo MARSHALL, head mar 58, Shepherd, born Hampshire, Headley
Mary MARSHALL, wife mar 40, Schoolmistress, born Hampshire, Empshott
Mary Ann MARSHALL, dau unm 20, Teacher, born ditto
James MARSHALL, son unm 14, Carpenters apprentice, born ditto
Walter MARSHALL, son 9, Scholar, born ditto
John MARSHALL, son 7, Scholar, born Sussex, Harting
Jane MARSHALL, dau 2, born ditto
RG10/1122/50/16
George has died between 1871 and 1881 as Mary is still there in 1881 and 1891.
From FreeBMD
Mary Ann KNOWLES birth, Dec qtr 1850, Petersfield, 7 134. Petersfield covers Empshott.
Ian C