Galenism, a rational, coherent medical system embracing all health and disease related matters, was the dominant medical doctrine in the Latin West during the Middle Ages and the Renaissance. Deriving from the medical and philosophical views of Galen (129-c.210/6) as well as from his clinical practice, Latin Galenism had its origins in 12th-century Salerno and was constructed from the cultural exchanges between the Arabic and Christian worlds. It flourished all over Europe, following the patterns of expansion of the university system during the subsequent centuries and was a major factor in shaping the healing systems of the Christian, Jewish and Muslim communities - the subject of a previous volume by Professor GarcA-a-Ballester. The present collection deals with a wide array of issues regarding the historical Galen and late medieval and Renaissance Galenism, but focuses in particular on the relationship between theory and practice. It includes first English versions of two major studies originally published in Spanish.