Context: Fairfax, played by actor Dougray Scott, is a pivotal character in the 2003 film To Kill a King, as well as in Rosemary Sutcliff's 1953 historical fiction Simon, being portrayed as inspiring and fair. He also appears as a central character in Sutcliff's 1959 novel The Rider of the White Horse, which gives an account of the early stage of the Civil War from the point of view of his wife, and in Howard Brenton's 2012 play 55 Days. Douglas Wilmer portrayed him in the 1970 Ken Hughes film Cromwell. He was played by Jerome Willis in the 1975 historical film Winstanley.  He appears in Michael Arnold's novel Marston Moor, which includes an account of Fairfax's adventures in the eponymous battle. He was also a central character, played by Nigel Anthony, in the 1988 BBC Radio production of Don Taylor's play God's Revolution.

Question: How many actors have portrayed Fairfax?

Answer:
4