International Congresses have been held as follows :
| Congrès | Date | Place |
|---|---|---|
| I | 1930 | Truro |
| II | 1948 | Quimper |
| III | 1951 | Winchester |
| IV | 1954 | Rennes |
| V | 1957 | Bangor |
| VI | 196O | Vannes |
| VII | 1963 | Aberdeen |
| VIII | 1966 | Caen |
| IX | 1969 | Cardiff |
| X | 1972 | Nantes |
| XI | 1975 | Exeter |
| XII | 1979 | Regensburg |
| XIII | 1981 | Glasgow |
| XIV | 1984 | Rennes |
| XV | 1987 | Leuven |
| XVI | 1990 | Durham |
| XVII | 1993 | Bonn |
| XVIII | 1996 | Garda |
| XIX | 1999 | Toulouse |
| XX | 2002 | Bangor |
| XXI | 2005 | Utrecht |
| XXII | 2008 | Rennes |
| XXIII | 2011 | Bristol |
| XXIV | 2014 | Bucharest |
| XXV | 2017 | Wurzburg |
| XXVI | 2021 | online (Catane cancelled) |
| XXVII | 2024 | Aix-en-Provence |
International Arthurian Society 