- These documents, many published in their entity, offer a valuable insight into the history of French customs and institutions. About 8,300 calendared acts of the French Kings, from Henry I (1031-1060) to Louis IX (1226-1270), are included. In addition to extensive analysis, the volumes contain historical studies on the mediaeval period. in the form of introductions acquired from the boxes called LAYETTES DU TRESOR DES CHARTES.