3 vol. (I – 478 p. – ; II – 700 p. – ; III – 348 p.)The abbey of Holy Trinity is, during the ducal period, one of the most prominent Norman Benedictine abbeys. This thesis studies and publishes its muniments as well as the archives of its priories up until 1190 and Raoul of Argences’ (1190-1219) appointment as abbot. The corpus of the critical edition (vol.II), beside the annexes (vol. III : proved forgeries, letters of administration, statistics, etc.), includes 308 entries, including 224 charters whose text has survived and 84 deperdita and legal actions that may have resulted in charters. The muniments are mainly kept at the Archives départementales de la Seine-Maritime, but the Palais Bénédictine in Fécamp keeps many charters as well, n...