During the years 1255-6, the Parisian secular theologian William of Saint-Amour emerged as the chief opponent of the mendicant orders. This present work surveys William's literary activities of these years and offers an analysis and editions of his four minor works: his responses to Bonaventure's disputed question De mendicitate and his three extant sermons Qui amat periculum, Si quis diligit me, and De pharisaeo et publicano.