Peter’s anti-Islamic polemic reached few medieval readers though his Koran translation circulated widely.

Evidence

Peter of Cluny’s anti-Muslim polemics were to have few readers during the Middle Ages: his Contra sectam siue haeresim Saracenorum survives in only one manuscript. Robert’s translation of the Koran survives in eighteen manuscripts, most of them from the fourteenth to sixteenth centuries. — John V. Tolan, Saracens, 873