The Trespasser is the second novel written by D. H. Lawrence, published in 1912. Originally it was entitled the Saga of Siegmund and drew upon the experiences of a friend of Lawrence, Helen Corke, and her adulterous relationship with a married man that ended with his suicide. Lawrence worked from Corke's diary, with her permission, but also urged her to publish; which she did in 1933 as Neutral Ground.