Cotton MS Cleopatra A VII, ff 107–165

This manuscript contains a copy of the treatise on the computus by Helperic of Auxerre, copied in the late 11th century. To this part were added two further computistical works dated to the middle of the 12th century (ff. 143v–147v) and the 2nd half of the 12th century (ff. 148r–165v). It features an anonymous treatise by an early 12th-century author who responds to Arabic astronomical works that had recently been translated into Latin and challenged the traditional (Roman) computus (see Nothaft, ‘Collatio Compoti Romani et Arabici’ (2015), 187-208).

ff. 101r-143r: Helperic of Auxerre (fl. 9th century), De Computo (On the Computus).

ff. 143v-147v: Collatio compoti Romani et Arabici (Comparison between the Roman and Arabic Computus).

ff. 148r-157r: Hermann of Reichenau [Hermannus Contractus] (b. 1013, d. 1054), Computus Abbreviatus (Abbreviated Computus).

ff. 157v-165v: Computistical argumenta.

Decoration:

Medium and small initials in red. Rubrics in red. Roman numerals in red [ff. 101r-143r]. Medium initials in green and red, some with penwork decoration; 1 medium initial in blue with penwork decoration in green and red (f. 148r); small initials in red; small (one-line) initials highlighted in red. Rubrics in red. Brown paraph marks highlighted in red. Tables drawn in red ink on f. 149r and f. 155r [ff. 143v-165v].