Note 413 — Chapter IV · THE SOURCES FOR THE PERIOD 1100–1250 A. D.

Steinschneider (op. cit., in: Bollettino, vol. xx, 1887, pp. 3–6) believed that there were two translations of the work of Az-Zarqalī because the manuscripts fall into two groups that differ markedly from each other. The manuscripts of one of these groups bear the name of Gerard of Cremona. Unfortunately, we lack confirmation of the attribution of this translation to Gerard in the list of seventy-four works of the great Cremonese discovered by Boncompagni in the Vatican (see Boncompagni, Della vita, 1851). Nevertheless it is highly probable that this list is incomplete, and there is no really good reason for supposing that Gerard was not the translator of the version in question.