This book is the first to be published from a wider research project, still in progress, about the sanctuaries of Poseidon and Athena on the promontory of Sounion (southeast Attica). The aim of this volume is to present, for the first time, a comprehensive examination and interpretation of a wide selection of unpublished small finds. These last, of different categories and materials, were discovered in the bothroi (pitdeposits) and the landfills; they are set into their contexts. The illustrations of the finds are integrated within the relevant text for easier reference and a detailed catalogue complements the discussion. The limited archaeological records concerning the work in the sanctuaries, conducted by Valerios Stais between 1897-1915, and which still remain the only extensive excavations undertaken, are re-evaluated. The author revisits the two sanctuaries, reviewing the structures within them to cast light on the early phases of their establishment and development, as well as their significance for the socio-economic growth of south east Attica. This is realized by drawing upon the evidence of archaeological data and the ancient literary sources alike. The research thus provides a fresh insight into the early cults, with emphasis on the identity of the deities worshipped at Sounion from the Late Geometric to the dawn of the Classical period.