Ms. written and illuminated in northern Italy, possibly Piacenza, between 1018 and 1032.
Texts: 1) fol.1: Liturgical text: Benedicamus Domino. Pacem tuam quesumus; 2) fol. 1v-10v: Martyrologium with calendrical material; 3) fol. 11v-33: Tables for computing chronology; 4) fol. 33v-37v: Gregory of Tours, De curso stellarum ratio qualiter ad officium implentum debeat observari; 5) fol. 37v: Numerus computusque latine dicitur; 6) fol. 37v-39v: Bede, De Temporum Ratione, Cap. I: De computo vel loquela digitorum; 7) fol. 39v-40v: Incipiunt nomina Latinorum regum; Nomina Imperatorum; De hinc reges Langobardorum; 8) fol. 41: De Laude compoti Augustinus dicit (an extract from De Computo dialogus, attributed to Bede; Diuisio tocius anni solaris et particio eius singulariter; 9) fol. 41v: Isidore of Seville, Quot athomos habet annus uel partos eius (from Etymologiae, XIII.2.); 10) fol. 42: De mensura et concordia singulorum mensium; 11) fol. 42v: Ad Kalendas inueniendum; 12) fol. 43: Five mnemonic poems; 13) fol. 44v-47: Discussion on the computation of Movable Feasts; 14) fol. 47: Spera cuiusdam; 15) fol. 47v-53: Anni domini notantur in presenti linea; 16) fol. 53: Paulus Diaconus, Versus de anni ab origine mundi; 17) fols. 53v-59: Argumentum ad inueniendum annum ab origine mundi...; 18) fols. 59-61: De mensibus unde exordium sumpserunt; 19) fol. 61: Incipit altercatio Theophili episcopi Cesariensis Palestine apud Niceam ciuitatem per auctoritatem Victori Pape; 20) fol. 62v: Spera celi quarter senis horis dum reuoluitur...; 21) fols. 62v-63: (bottom margins) poem in 14th-century Italian cursive beginning: Aureus hac arte numerus formatur aparte...; 22) fol. 63: Horologium viatoris; 23) fols. 63v-64v: Pectosiris necnepso regi salutem. De his que a me ad humane uite cautelam...; 24) fol. 64v: (inner margins): 2 recipes in 14th-century Italian cursive; 25) fol. 65r and v: Liturgical texts with plainsong in staffless neumes; 26) fols. 66-73v: Bene de Lucca, Computus lunaris, inc.: Computus lunaris est scientia rectificandi tempus secundum solis et lune propossum...
Decoration: 36 drawings of computational hand gestures (fols 38-38v); 1 full-length figure making the hand position for 1,000,000 (fol. 39); 1 drawing of a labyrinth with the Minotaur at center (fol. 12); 2 circular diagrams (fols. 23, 24); drawing of a windrose (fol. 23v); 1 elaborately decorated sphere (fol. 47); 1 drawing of the sundial (fol. 63); 1 drawing of the magic circle (fol. 63v); 1 drawing of King Necepsus enthroned in his palace, Petrosyris writing before him (fol. 63v); drawings of stars (fol. 34-37v); 26 decorated tables throughout the manuscript; 1 rough copy of the magic circle on fol. 63v (fol. 74).
Musical notation: fol. 1, 65r and v, plainsong music in staffless neumes.