The aim of this article is to publish David French's manuscript on Lefkandi Phase I, in as close a form as possible to what he wrote. Some changes have been necessary to improve the presentation of the material, to correct occasional errors, and to conform with BSA stylistic requirements. The material discussed is essentially that from the lowest levels of the ‘Deep Sounding’ in Trench CC. The discussion has four sections. The first section is a very brief comment on the stratigraphical data, including sections of the Lefkandi Phase I stratum in Trench CC and plans of the remains of sub-phases. The second section is the core of the paper, a general account of the pottery, listing wares and shapes identifiable, which demonstrates that it contains a little material from periods certain or likely to be earlier than Phase I (Final Neolithic, Early Helladic I and Early Helladic II), also later strays, but essentially belongs to a range of wares that have clear West Anatolian links, although it cannot be linked exclusively with any individual Anatolian site or region. The third section lists the small finds from the stratum, with catalogue entries on the most significant, including a seal impression on a probable pithos rim fragment. Finally, the fourth section sums up views on the classification of the pottery, its chronological relationship with the Early Helladic sequence, its cultural relationship with West Anatolian material, and the question of how an essentially Anatolian style of pottery came to be locally produced in Euboea, with a range of references to comparable material from other Aegean sites.