“…His medical history has generated recurrent dispute and may be highly relevant to his varied policies and actions and his responses to life’s events. The starting point for this study followed previous work (Peters and Beveridge, 2010; Peters and Wilkinson, 2010) on the nature of King George III’s mental disorder, claimed to have been due to acute porphyria (Macalpine and Hunter, 1969), a view that has been repeatedly re-stated (Beasley, 1995; Fraser, 1974; Röhl, Warren and Hunt, 1998; Smith, 1973; Rutherford, 2010; Trevor-Roper, 2006; Watkin, 2004). It has also been repeatedly claimed that the origin of the porphyria suffered by George III can be attributed to the disease in James VI/I and his immediate relatives (Cox et al, 2005; Hurst, 1982; Macalpine, Hunter and Rimington, 1968; Rushton, 2008).…”