After the fifteenth century, alliterative verse became fairly uncommon; possibly the last major poem in the tradition is William Dunbar's "Tretis of the Tua Marriit Wemen and the Wedo" (c. 1500). By the middle of the sixteenth century, the four-beat alliterative line had completely vanished, at least from the written tradition: the last poem using the form that has survived, "Scotish Feilde", was written in or soon after 1515 for the circle of Thomas Stanley, 2nd Earl of Derby in commemoration of the Battle of Flodden.