_ Source: _Volume 26, Issue 2, pp 174 - 211 This article explores the metaphysical, epistemological, and mystical aspects of happiness in the Judeo-Arabic _Treatise on Ultimate Happiness_, of which only two chapters have survived from what is thought to have been a more comprehensive text. Although the treatise is attributed to Moses Maimonides, the conception of happiness it presents is clearly that of the Pietists, the Jewish-Sufi circle of thirteenth-century Egypt. The discussion of happiness in this short treatise constitutes (...) an important chapter in the philosophical and mystical discourse about happiness in medieval Jewish-Islamic thought, especially within the Jewish-Sufi mystical stream led by Maimonides’s descendants. (shrink)