In this monograph the authors present the finds of four Mycenaean chamber tombs, from the rescue excavation of Ephor Mastrokostas at Aigion in 1967. Unfortunately, no diary or any other information, regarding the architecture or the burial customs, was found. However, it is highly possible that they were similar to eleven tombs which were systematically excavated by Papadopoulos in 1970. In contrast with them, the four tombs produced a much greater number of finds, indicating richer burials. Furthermore, some of these finds are unique (e.g. “thronos”-straight-sided alabastron with unusual paneled decoration), rare (e.g. askoi) and exceptional (e.g. cylindrical stirrup jars) in the Achaean Mycenaean ceramic repertory, while the total absence of terracotta figurines as well as the rarity of small objects is surprising. Taken together the excavated tombs make a total of 15, but the actual number may be greater. It is noteworthy that the material is stylistically different and generally earlier from that of western Achaea. The supplementary information, provided by this publication, strengthens the evidence that this important Achaean cemetery was used for a long time (LHII-IIIC) and that the inhabitants had connections with the Argolid as well as with other areas to the east, especially with the Dodecanese.