Dear Sophie, For the development of the cult of St. Nicholas I can recommend the exhaustive study of: Ch. W. Jones, The Saint Nicholas liturgy and its literary relationships (ninth to twelfth centuries), Berkeley 1963. If you can read Dutch the following book can be handy too: Louis Janssen, Nicolaas, de duivel en de doden: opstellen over volkscultuur, Baar 1993, which focusses on death etc. Hope there is something in them for you, Bram van den Hoven van Genderen, University of Utrecht %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%