This article is a critical reassessment of the major Knossian deposits assigned by Evans to the Middle Minoan I A phase. It is divided into three main sections: first, an introduction, in which the author discusses the development of the definition of Knossian MM IA pottery; second, a detailed discussion of each deposit, based upon a systematic and first-hand re-examination of the ceramic material, and of the relevant written sources; third, a discussion of the problems concerning the classification of these deposits, and a typological study of their ceramic assemblages. The picture of Knossian MM IA pottery which emerges from this study is remarkably different from that presented by Evans, which is generally accepted. This has further implications not only for the study of Minoan pottery, but also for the early history of the site.