Dendrochronological analysis of a group of waterlogged Roman piles excavated at Pevensey Castle, East Sussex, has resulted in the production of a chronology dating from AD 131-270 inclusive. The timbers appear to have been felled between c AD 280 and c AD 300, although precise felling dates are not obtainable due to the condition of the surviving timbers. The result illuminates aspects of the site phasing and provides the first tree-ring dated evidence relating to installations from the 'Saxon Shore'.