• Detail of a decorated initial 'I'(ntencio) at the beginning of Robert Grosseteste's De sphaera., Various calendarial and computistical treatises

of the foundation collections of the British Library. Detail Various authors including Bede, Johannes de Sacro Bosco (index Johannes de Sacrobosco, John de Sacrobosco), Robertus Anglicus (index Iohannes Anglicus de Montepessulano; Robertus Anglicus of Montpellier), Robert Grosseteste (index Lincolniensis) England

• Detail of an astronomical diagram illustrating Robert Grosseteste's De sphaera., Various calendarial and computistical treatises

of the foundation collections of the British Library. Detail Various authors including Bede, Johannes de Sacro Bosco (index Johannes de Sacrobosco, John de Sacrobosco), Robertus Anglicus (index Iohannes Anglicus de Montepessulano; Robertus Anglicus of Montpellier), Robert Grosseteste (index Lincolniensis) England

• Detail of a decorated initial 'I'(ntencio) at the beginning of Robert Grosseteste's De sphaera., Various calendarial and computistical treatises

the foundation collections of the British Library. Decorated initial Various authors including Bede, Johannes de Sacro Bosco (index Johannes de Sacrobosco, John de Sacrobosco), Robertus Anglicus (index Iohannes Anglicus de Montepessulano; Robertus Anglicus of Montpellier), Robert Grosseteste (index Lincolniensis) England

• Detail of an astronomical diagram showing an eclipse of the moon, illustrating Robert Grosseteste's De sphaera., Various calendarial and computistical treatises

of the foundation collections of the British Library. Detail Various authors including Bede, Johannes de Sacro Bosco (index Johannes de Sacrobosco, John de Sacrobosco), Robertus Anglicus (index Iohannes Anglicus de Montepessulano; Robertus Anglicus of Montpellier), Robert Grosseteste (index Lincolniensis) England

• Detail of an astronomical diagram showing an eclipse of the sun, illustrating Robert Grosseteste's De sphaera., Various calendarial and computistical treatises

of the foundation collections of the British Library. Detail Various authors including Bede, Johannes de Sacro Bosco (index Johannes de Sacrobosco, John de Sacrobosco), Robertus Anglicus (index Iohannes Anglicus de Montepessulano; Robertus Anglicus of Montpellier), Robert Grosseteste (index Lincolniensis) England

• Text page with calendrical tables illustrating Robert Grosseteste's Computus correctorius., Various calendarial and computistical treatises

of the foundation collections of the British Library. Tables Various authors including Bede, Johannes de Sacro Bosco (index Johannes de Sacrobosco, John de Sacrobosco), Robertus Anglicus (index Iohannes Anglicus de Montepessulano; Robertus Anglicus of Montpellier), Robert Grosseteste (index Lincolniensis) England

• Historiated initial 'I'(ntentio) of a man holding an orb at the beginning of Grosseteste's Computus correctorius, astronomical diagram at the bottom of the page., Various astronomical and calendrical texts including Grosseteste's Computus correctorius (index Computus correctorius) (ff. 4-15), Sacro Bosco's Algorismus (ff. 15v-25v), Nemore's De plana sphaera (index Demonstratio de plana spera; Planispherium)(ff. 30-36v), Albumasar's De floribus astrorum (ff. 43v-67v), and a glossed Computus with calendar (ff. 68-119v)

Man holding an orb Written by different scribes Various authors including Robert Grosseteste (index Lincolniensis), Johannes de Sacro Bosco (index Johannes de Sacrobosco, Iohannes de Sacro Bosco, John de Sacrobosco), Jordanus de Nemore, Albumasar France and England (ff. 114-119v only)

• Detail of a historiated initial 'S'(pera) decorated with a cockerell head and a dragon head, containing a man holding an astrolabe, at the beginning of Jordanus de Nemore's De plana sphaera; geometrical diagram in the margin., Various astronomical and calendrical texts including Grosseteste's Computus correctorius (index Computus correctorius) (ff. 4-15), Sacro Bosco's Algorismus (ff. 15v-25v), Nemore's De plana sphaera (index Demonstratio de plana spera; Planispherium)(ff. 30-36v), Albumasar's De floribus astrorum (ff. 43v-67v), and a glossed Computus with calendar (ff. 68-119v)

the British Library. Detail Written by different scribes Various authors including Robert Grosseteste (index Lincolniensis), Johannes de Sacro Bosco (index Johannes de Sacrobosco, Iohannes de Sacro Bosco, John de Sacrobosco), Jordanus de Nemore, Albumasar France and England (ff. 114-119v only)

• Historiated initial 'S'(pera) decorated with a cockerell head and a dragon head, containing a man holding an astrolabe, at the beginning of Jordanus de Nemore's De plana sphaera; geometrical diagram in the margin., Various astronomical and calendrical texts including Grosseteste's Computus correctorius (index Computus correctorius) (ff. 4-15), Sacro Bosco's Algorismus (ff. 15v-25v), Nemore's De plana sphaera (index Demonstratio de plana spera; Planispherium)(ff. 30-36v), Albumasar's De floribus astrorum (ff. 43v-67v), and a glossed Computus with calendar (ff. 68-119v)

Library. Man with astrolabe Written by different scribes Various authors including Robert Grosseteste (index Lincolniensis), Johannes de Sacro Bosco (index Johannes de Sacrobosco, Iohannes de Sacro Bosco, John de Sacrobosco), Jordanus de Nemore, Albumasar France and England (ff. 114-119v only)

• Historiated initial 'C'(ompotus) of a man reading at the beginning of the glossed Computus with calendar., Various astronomical and calendrical texts including Grosseteste's Computus correctorius (index Computus correctorius) (ff. 4-15), Sacro Bosco's Algorismus (ff. 15v-25v), Nemore's De plana sphaera (index Demonstratio de plana spera; Planispherium)(ff. 30-36v), Albumasar's De floribus astrorum (ff. 43v-67v), and a glossed Computus with calendar (ff. 68-119v)

British Library. Man reading Written by different scribes Various authors including Robert Grosseteste (index Lincolniensis), Johannes de Sacro Bosco (index Johannes de Sacrobosco, Iohannes de Sacro Bosco, John de Sacrobosco), Jordanus de Nemore, Albumasar France and England (ff. 114-119v only)

• Detail of a historiated initial 'C'(ompotus) of a man reading at the beginning of the glossed Computus with calendar., Various astronomical and calendrical texts including Grosseteste's Computus correctorius (index Computus correctorius) (ff. 4-15), Sacro Bosco's Algorismus (ff. 15v-25v), Nemore's De plana sphaera (index Demonstratio de plana spera; Planispherium)(ff. 30-36v), Albumasar's De floribus astrorum (ff. 43v-67v), and a glossed Computus with calendar (ff. 68-119v)

the British Library. Detail Written by different scribes Various authors including Robert Grosseteste (index Lincolniensis), Johannes de Sacro Bosco (index Johannes de Sacrobosco, Iohannes de Sacro Bosco, John de Sacrobosco), Jordanus de Nemore, Albumasar France and England (ff. 114-119v only)

• Text page of Virgil's Eclogues., Avianus fables, with gloss

Text page of Virgil's Eclogues. Peter of Blois's 'Speculum iuris canonici' consists of 60 chapters, each devoted to a legal argument. Peter, who is not to be confused with his older and more famous namesake, the archdeacon of Bath

• Text page at the beginning of Persius's Satires., Avianus fables, with gloss

Text page at the beginning of Persius's Satires. Peter of Blois's 'Speculum iuris canonici' consists of 60 chapters, each devoted to a legal argument. Peter, who is not to be confused with his older and more famous namesake, the

• Ownership inscription of Simon, abbot of the Benedictine abbey of St. Mary and St. Benedict, Ramsey, 'Liber domini Simon. abbatis Rameseye', with a table of contents., De consensu evangelistarum, De musica

393) (f. 84v);Pseudo-Augustine, Sermo de oratione dominica (serm. 58) (f. 84v) (all texts are attributed to Augustine in the manuscript); John of Damascus trad. by Burgundio of Pisa, De fide orthodoxa (ff. 85-107v); Thomas Gallus, 'Extractio' (attributed here to Dionysius

• Less colourful than the first two major divisions at Psalms 1 and 51, the large decorated initial 'D'(omine) and display capitals at the beginning of Psalm 101 are here executed in just blue and red, with some details in orange. Between the lines of the main Latin text is a translation in Old English., Psalter, in the Roman version (ff. 4-95), with canticles (ff. 96-104), a short litany (f. 104), a hymnal (ff. 105-128) and monastic canticles (ff. 129-135); added calendar (ff. 2,3) (the 'Bosworth Psalter')

earl of Arundel (b. 1512, d. 1580): inscribed 'Arundel' (f. 2); the Arundel collection bequeathed to Lord Lumley, his son-in-law. John Lumley, 1st baron Lumley (b. c.1533, d. 1609), collector and conspirator: inscribed with his name (f. 2). ? Perhaps

• Initial 'P'(rimo) with foliate decoration at the beginning of the hymns., Psalter, in the Roman version (ff. 4-95), with canticles (ff. 96-104), a short litany (f. 104), a hymnal (ff. 105-128) and monastic canticles (ff. 129-135); added calendar (ff. 2,3) (the 'Bosworth Psalter')

earl of Arundel (b. 1512, d. 1580): inscribed 'Arundel' (f. 2); the Arundel collection bequeathed to Lord Lumley, his son-in-law. John Lumley, 1st baron Lumley (b. c.1533, d. 1609), collector and conspirator: inscribed with his name (f. 2). ? Perhaps

• 3 incomplete initials showing the three first stages in the production of a decorated initial: in the right-hand column is a space for an initial 'T' that has not been started; to its left is a 'VD' monogram whose design has been sketched in lead point; and above this is a 'P' whose design has been inked-over., Psalter, in the Roman version (ff. 4-95), with canticles (ff. 96-104), a short litany (f. 104), a hymnal (ff. 105-128) and monastic canticles (ff. 129-135); added calendar (ff. 2,3) (the 'Bosworth Psalter')

earl of Arundel (b. 1512, d. 1580): inscribed 'Arundel' (f. 2); the Arundel collection bequeathed to Lord Lumley, his son-in-law. John Lumley, 1st baron Lumley (b. c.1533, d. 1609), collector and conspirator: inscribed with his name (f. 2). ? Perhaps

• Puzzle initial 'S'(usceptis) with foliate penwork decoration and pen-flourishing extending into the margin with a fish., Register of letters (ff. 7v-198v), with table of chapters (ff. 1-7); Dialogue of Basil and John Chrysostom (ff. 198-224); Isidore of Seville on Music (ff. 224v-225)

without blue pen-flourishing (ff. 224v-225v). Register of letters (ff. 7v-198v), with table of chapters (ff. 1-7); Dialogue of Basil and John Chrysostom (ff. 198-224); Isidore of Seville on Music (ff. 224v-225) The Cistercian abbey of St Mary, Cambron: inscribed 'Liber

• Puzzle initial 'M'(ichi) with a colophon above., Register of letters (ff. 7v-198v), with table of chapters (ff. 1-7); Dialogue of Basil and John Chrysostom (ff. 198-224); Isidore of Seville on Music (ff. 224v-225)

without blue pen-flourishing (ff. 224v-225v). Register of letters (ff. 7v-198v), with table of chapters (ff. 1-7); Dialogue of Basil and John Chrysostom (ff. 198-224); Isidore of Seville on Music (ff. 224v-225) The Cistercian abbey of St Mary, Cambron: inscribed 'Liber

• Detail of colophon: 'Explicit Register beati Gregorij pape urbis Rome. Quem scripsit frater johannes dictus toussens monaschus de camberone'., Register of letters (ff. 7v-198v), with table of chapters (ff. 1-7); Dialogue of Basil and John Chrysostom (ff. 198-224); Isidore of Seville on Music (ff. 224v-225)

without blue pen-flourishing (ff. 224v-225v). Register of letters (ff. 7v-198v), with table of chapters (ff. 1-7); Dialogue of Basil and John Chrysostom (ff. 198-224); Isidore of Seville on Music (ff. 224v-225) The Cistercian abbey of St Mary, Cambron: inscribed 'Liber