'Amys and Amylion' is a medieval poem of treason and forbidden love, of loyalty and suffering, of crime and miracles; above all, it tells of the unconditional friendship uniting two knights throughout their life and beyond their death. This story fascinated the Middle Ages; versions of it are found in Latin, French, German, Welsh, Old Norse and Flemish, as well as English. The adventures of Amys and Amylion lie close to the sensibilities of the age, but the contemporary reader should find that the poem remains both entertaining and compelling in its own right. This edition is based on the only extant manuscript to have preserved the complete text of the English 'Amys and Amylion'. It includes accessible notes and a full glossary.