I am enormously indebted to the great Bulgarian writer and medievalist, Stefan Gechev, who suggested ths significance of this topic, and to whose memory this book is dedicated.

From the very beginning I benefited from the moral and scholarly support of the distinguished Corresponding member of Bulgarian Academy of Sciences, Professor Vassil Gyuzelev, and I present him all my gratitude. For help with literature and and useful suggestions I wish to thank Professor Alexander Shurbanov, University of Sofia. My particular appreciation goes to Dr Boyka Sokolova, University of London, who gave me valuable books and translated part of this study into English.

I owe special dept of thanks to the eminent scholar Professor Anne Hudson, Oxford, who donated sources of true merit: Fasciculi Zizaniorum Magistri Johannis Wycliff cum tritico, edited by Walter Shirley. London.1858.

I present my heartfelt gratitude to Professor Simeon Hadjikosev, University of Sofia, who was the originator of the academic recognition of this work.