Sir Walter Scott was a prolific Scottish historical novelist, poet, and playwright. He is often credited with popularizing the genre of the historical novel and is widely regarded as one of the greatest authors of all time. His most famous works include Ivanhoe, Rob Roy, The Lady of the Lake, and Waverley. He was also known by his pen name, 'The Wizard of the North'. The answer to the crossword is 'SCOTT', which is the surname of this renowned author.