Tess Durbeyfield is the protagonist of Tess of the D'Urbervilles, written by English novelist Thomas Hardy and published in 1891. Tess is a beautiful, loyal young woman living with her impoverished family in the village of Marlott. Tess has a keen sense of responsibility and is committed to doing the best she can for her family, although her inexperience and lack of wise parenting leave her extremely vulnerable. Her life is complicated when her father discovers a link to the noble line of the d'Urbervilles, and, as a result, Tess is sent to work at the d'Urberville mansion. Unfortunately, her ideals cannot prevent her from sliding further and further into misfortune after she becomes pregnant by Alec d'Urberville. The terrible irony is that Tess and her family are not really related to this branch of the d'Urbervilles at all: Alec's father, a merchant named Simon Stokes, simply assumed the name after he retired.
From Sparknotes.com