Selection of references used:
1. J. Raine, Historic Towns: York 2. M.R.James, Abbeys, 1925 3. C.W.Previte-Orton, The shorter Cambridge Medieval History 4. Magnus Magnusson, Vikings! 5. G.A.Cambell, The Knights Templar. Their rise and fall 6. Richard Cavendish, Kings and Queens The Concise Guide, 978-0-7153-2376-2 7. www.volcano.si.edu/world/volcano.cfm?vnum=1702-03=&volpage=erupt, Global Volcanism Program 8. Richard Humble, The Fall of Saxon England
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