In his responsa (No. 114) he mentions a certain Jacob Margolioth of לוקו (Lucca?), and refers to a case of divorce in Posen in 1444 (Steinschneider gives 1474). Fränkel (Zeitschrift, iii. 387) doubts that Moses ever was at Posen. He suggests that פוזנו (Posen) is a printer's mistake for פיזרו (Pesaro). Moses' responsa (Cracow, 1617) mention also Joseph Colon, Israel Isserlein, and his cousin Judah Minz. Responsum No. 46 contains a dispute over a philological point with Eliezer Treves (comp. M. Wiener in Monatsschrift, xvi. 390).