The study presents a so far overlooked treatise on the art of memory preserved in a copy made in 1461 by a certain Johannes de Fredelant, kept in one of the miscellanies of Crux de Telcz (1434-1504), today MS Prague, National library, I G 11a, ff. 31r-41v, preceded by three other treatises on the art of memory, as well as several mnemonic verses. As the analysis of the treatise shows, it is based on the anonymous art of memory treatise Memoria fecunda written in Bologna in 1425, although it omits its specific features and seems to be both more traditional and simple practice-oriented.