• Decorated initial 'T'(his) at the beginning of a treatise in Middle English by Leonel Power on discant, which begins: 'This treatise is contrived upon the Gamme for them that will be singers or makers or teachers. For the first thing of all they must know how many chords of discant there be . . .' (spelling modernised)., Musical miscellany, including the Musica manualis cum tonale; Thomas Walsingham's treatise on mensural music (ff. 97v–104v)

Fitzmaurice) (b. 1737, d. 1805), 2nd earl of Shelburne and 1st marquess of Lansdowne, prime minister: his book-plate (f. [ii]); purchased by the British Museum together with 1244 other Lansdowne manuscripts in 1807. Decorated initial John Wylde John Wylde England

• On what was originally the final folio of the manuscript the signature 'Thomas tallys' above the same name in large capital letters., Musical miscellany, including the Musica manualis cum tonale; Thomas Walsingham's treatise on mensural music (ff. 97v–104v)

Fitzmaurice) (b. 1737, d. 1805), 2nd earl of Shelburne and 1st marquess of Lansdowne, prime minister: his book-plate (f. [ii]); purchased by the British Museum together with 1244 other Lansdowne manuscripts in 1807. Ownership inscription John Wylde John Wylde England

• On the flyleaf immediately preceding the start of the text is this inscription that the manuscript was written by Johannes Wylde, former precentor of Holy Cross, Waltham, followed by an anathema. Below this the same inscription was later copied out in black ink., Musical miscellany, including the Musica manualis cum tonale; Thomas Walsingham's treatise on mensural music (ff. 97v–104v)

Fitzmaurice) (b. 1737, d. 1805), 2nd earl of Shelburne and 1st marquess of Lansdowne, prime minister: his book-plate (f. [ii]); purchased by the British Museum together with 1244 other Lansdowne manuscripts in 1807. Ownership inscription John Wylde John Wylde England

• Decorated initial 'Q' at the beging of a text that is attributed in the rubric to the monk Guido (Guy)., Musical miscellany, including the Musica manualis cum tonale; Thomas Walsingham's treatise on mensural music (ff. 97v–104v)

Fitzmaurice) (b. 1737, d. 1805), 2nd earl of Shelburne and 1st marquess of Lansdowne, prime minister: his book-plate (f. [ii]); purchased by the British Museum together with 1244 other Lansdowne manuscripts in 1807. Decorated initial John Wylde John Wylde England

• Diagram illustrating the principle that a monochord (a single-stringed instrument) produces notes which are related in tone to the length of the chord., Musical miscellany, including the Musica manualis cum tonale; Thomas Walsingham's treatise on mensural music (ff. 97v–104v)

(~formerly~ Fitzmaurice) (b. 1737, d. 1805), 2nd earl of Shelburne and 1st marquess of Lansdowne, prime minister: his book-plate (f. [ii]); purchased by the British Museum together with 1244 other Lansdowne manuscripts in 1807. Diagram John Wylde John Wylde England

• Illuminated 'KL' letters in the calendar page for February, with the later additions of the death of 'John Holebrook' in 1400 added to 13 February. The inscription in red in the last line gives the number of hours for nights (14) and days (10) in February., Psalter (the 'Egerton Psalter'), with calendar, Office of the Dead (imperfect), litany, and prayers

John de Holebrook, 1309 (f. 3v); John, son of John de Holebrook (f. 5); Petronilla de Holebrook (f. 6).Added inscriptions of obits in the calendar: John King, 1589 (f. 3); Richard King, 1567 (f. 4); Joan King, wife of

• Ownership inscription of Alice d'Avesnes, reading ' 'Ici comence en francoys la promiere collection en francois que len apele autentices e est a Alis de heynau / contesse de Norfolk et mareshale dangleterre file le conte Iohan de (hey[na]u) a qi la conte de Hollande et de Selande e la / signorie de frise eschey. / Pries pour le conte Rogier mareschal son signour e por lavant dite Alis e por le cinte Ioh[a]n son pere e por / la contesse phelippe sa mere e por mon[signour] Ioh[a]n de hastinges sire de bergeueny a qui le livre fu en aucun tens / e pour tous les amis e les amies a lavant dite Alis e por tous ceus a qui ele estoit tenue.', Authenticum and Tres Libri

dominus de Manchestre' [John, 4th baron De la Warr, (b. c.1345, d. 1398), his cousin], John de Waltham (d. 1395), bishop of Salisbury, John, lord Ross of Hamlake, Sir William de Skipwith (b. c.1320, d. before 1398), John de Ravensere,

• Miniature of John the Baptist, with Agnus Dei, faceing the text of a prayer to St John the Baptist., Added prayers to saints

of Anne of York.Part 2:Margaret Beauchamp (b. 1405/6, d. 1482), duchess of Somerset, daughter of John Beauchamp of Bletsoe, married to Sir Oliver St John,John Beaufort, and Lionel de Welles, 6th Baron Welles, probably made for her before 1443:

• Detail of a miniature of Charlemagne at a table receiving a letter, with a partial border and a foliate initial 'O'(r dist)., Renaut de Montauban (or Les Quatre Fils Aimon)

manuscripts produced for John Talbot, earl of Shrewsbury: Royal 15 E VI, a collection of romances presented to Margaret of Anjou in honour of her marriage to Henry VI in 1445; and Cambridge, Fitzwilliam Museum, 40.1950, the 'John Talbot Book

• Detail of a circular diagram illustrating principles of natural philosophy., Dragmaticon philosophiae, imperfect at the beginning and the end (index Dramaticon)

marked in red. Dragmaticon philosophiae, imperfect at the beginning and the end (index Dramaticon) John Theyer (bap. 1598, d. 1673), antiquary: inscribed with his name, 'John Thayer' (f. 1), but not identified in his sale catalogue.Charles II (b. 1630, d.1685),

• Detail of diagram of primary qualities and elements based on Aristotelian and Platonic theories., Dragmaticon philosophiae, imperfect at the beginning and the end (index Dramaticon)

marked in red. Dragmaticon philosophiae, imperfect at the beginning and the end (index Dramaticon) John Theyer (bap. 1598, d. 1673), antiquary: inscribed with his name, 'John Thayer' (f. 1), but not identified in his sale catalogue.Charles II (b. 1630, d.1685),

• Detail of a diagram of the zodiac., Dragmaticon philosophiae, imperfect at the beginning and the end (index Dramaticon)

marked in red. Dragmaticon philosophiae, imperfect at the beginning and the end (index Dramaticon) John Theyer (bap. 1598, d. 1673), antiquary: inscribed with his name, 'John Thayer' (f. 1), but not identified in his sale catalogue.Charles II (b. 1630, d.1685),

• Detail of circular diagrams illustrating principles of natural philosophy., Dragmaticon philosophiae, imperfect at the beginning and the end (index Dramaticon)

marked in red. Dragmaticon philosophiae, imperfect at the beginning and the end (index Dramaticon) John Theyer (bap. 1598, d. 1673), antiquary: inscribed with his name, 'John Thayer' (f. 1), but not identified in his sale catalogue.Charles II (b. 1630, d.1685),

• Detail of a diagram of the motions of Saturn., Dragmaticon philosophiae, imperfect at the beginning and the end (index Dramaticon)

marked in red. Dragmaticon philosophiae, imperfect at the beginning and the end (index Dramaticon) John Theyer (bap. 1598, d. 1673), antiquary: inscribed with his name, 'John Thayer' (f. 1), but not identified in his sale catalogue.Charles II (b. 1630, d.1685),

• Detail of a diagram of the sun with Mercury and Venus., Dragmaticon philosophiae, imperfect at the beginning and the end (index Dramaticon)

marked in red. Dragmaticon philosophiae, imperfect at the beginning and the end (index Dramaticon) John Theyer (bap. 1598, d. 1673), antiquary: inscribed with his name, 'John Thayer' (f. 1), but not identified in his sale catalogue.Charles II (b. 1630, d.1685),

• Detail of a diagram of the double course of the moon and the central path of the sun., Dragmaticon philosophiae, imperfect at the beginning and the end (index Dramaticon)

marked in red. Dragmaticon philosophiae, imperfect at the beginning and the end (index Dramaticon) John Theyer (bap. 1598, d. 1673), antiquary: inscribed with his name, 'John Thayer' (f. 1), but not identified in his sale catalogue.Charles II (b. 1630, d.1685),

• Detail of a diagram of the zodiac., Dragmaticon philosophiae, imperfect at the beginning and the end (index Dramaticon)

marked in red. Dragmaticon philosophiae, imperfect at the beginning and the end (index Dramaticon) John Theyer (bap. 1598, d. 1673), antiquary: inscribed with his name, 'John Thayer' (f. 1), but not identified in his sale catalogue.Charles II (b. 1630, d.1685),

• Initial 'V' with filigree penwork decoration., Leaves from an Antiphoner (index antiphonal, antiphonary)

order Add. 22310. 7 large historiated initials in colours and gold, of Michael, the Presentation in the Temple, Peter, Lucy, John the Baptist, Longinus, and Simon and Andrew (ff. 2, 3v, 4v, 5v, 6v, 7v, 8v), with foliate extension and

• Historiated initial 'V' of Michael weighing a soul., Leaves from an Antiphoner (index antiphonal, antiphonary)

order Add. 22310. 7 large historiated initials in colours and gold, of Michael, the Presentation in the Temple, Peter, Lucy, John the Baptist, Longinus, and Simon and Andrew (ff. 2, 3v, 4v, 5v, 6v, 7v, 8v), with foliate extension and

• Historiatd initial 'A' of the Presentation in the Temple., Leaves from an Antiphoner (index antiphonal, antiphonary)

order Add. 22310. 7 large historiated initials in colours and gold, of Michael, the Presentation in the Temple, Peter, Lucy, John the Baptist, Longinus, and Simon and Andrew (ff. 2, 3v, 4v, 5v, 6v, 7v, 8v), with foliate extension and