Sir Mark Masterman Sykes, Bart., was the eldest son of Sir Christopher Sykes, second baronet, of Sledmere, Yorkshire. He was born on the 20th of August 1771, and in his seventeenth year was sent to Brasenose College, Oxford. In 1795 he served the office of High Sheriff of Yorkshire, and on the death of his father in 1801 he succeeded to the title and estates. He was elected Member of Parliament for the city of York in 1807; was again returned in 1812 and 1813, and retired on account of ill health in 1820. Sir M. Masterman Sykes was twice married. His first wife was Henrietta, daughter and heiress of Henry Masterman of Settrington, Yorkshire, and on his union with her in 1795 he assumed the additional name of Masterman. She died in 1813, and in the following year he married Mary Elizabeth, daughter of William Tatton Egerton, and sister of Wilbraham Tatton Egerton, of Tatton Park, who survived him. Sir Mark died at Weymouth, on his way to London, on the 16th of February 1823. He had no children, and was succeeded by his brother, Sir Tatton Sykes.

Sir M. Masterman Sykes early developed a love for books, and the magnificent library which he formed, one of the finest private collections in England, was the result of upwards of thirty years' unremitting and careful work. Some of the rare volumes it contained, we are informed in the preface to the sale catalogue of his library written by the Rev. H.J. Todd, 'were procured during the collector's travels abroad, but many of them were acquired at the dispersion of the libraries of Major Pearson, Dr. Farmer, Steevens, Reed, the Rev. Mr. Brand, the Duke of Roxburghe and others, but especially of that of the late Mr. Edwards, from whom the celebrated Livy of 1469 was obtained—the only known copy of the first edition of Livy on vellum.'

Among the principal treasures of the collection were the Gutenberg Bible; the Psalter of 1459, on vellum; the Rationale Divinorum Officiorum of Durandus, on vellum, 1459; the Catholicon of Joannes Balbus de Janua, 1460; the Latin Bible of 1462, on vellum; and the Epistles of St. Jerome, on vellum, 1470: all printed at Mentz.

The library was especially rich in early editions of the Greek and Latin Classics, and on its shelves were to be found the only copy known to exist on vellum of the first edition of Livy, printed at Rome by Sweynheym and Pannartz about 1469, to which we have already referred; the first edition of Pliny, printed by Joannes de Spira at Venice in 1469; that printed at Rome by Sweynheym and Pannartz in 1470; a copy on vellum of the beautiful 1472 edition from the press of Nicolas Jenson of Venice; and the earliest editions of Homer, Cicero, Horace, Virgil, Tacitus, Terence, and Valerius Maximus.

The library also contained the Dante printed at Foligno in 1472, and that printed at Florence in 1481; the first issue of the Latin translation of the Letter of Columbus, printed at Rome in 1493; a fine copy of the Poliphili Hypnerotomachia, printed by Aldus at Venice in 1499; the Aldine Petrarch of 1501; several rare Missals and Books of Hours, the most notable of them being a vellum copy of the Vallombrosa Missal, printed at Florence in 1503; and a copy of the Tewrdannck, also on vellum, printed at Nuremberg in 1517.

There were several Caxtons, among them being The Myrrour of the World and Higden's Polychronicon.

The literature of the reigns of Elizabeth and James I. was well represented, and the library contained a copy of that rare work, Archbishop Parker's De Antiquitate EcclesiÆ BritannicÆ.

The collection also comprised several fine and interesting manuscripts. Deserving especial notice were a beautiful illuminated Office, on vellum, of the Virgin Mary, executed for Francis I., King of France; the original Report of Convocation to Henry VIII. on the Legality of his proposed Divorce from Anne of Cleves, subscribed with the autograph signatures of the Archbishop and all the Bishops and Clergy assembled in Convocation, dated July 9th, 1540; and an autograph manuscript of Dugdale's Visitation of the County of York in 1665-66.

Sir M. Masterman Sykes possessed an immense collection of prints. It included a complete set of Bartolozzi's engravings which is said to have cost Sir Mark nearly five thousand pounds; his collection of portraits was considered to be one of the best in the kingdom; and Dibdin declared that his 'Faithornes and Hollars almost defied competition.' He also accumulated a considerable number of pictures, bronzes, coins and medals.

All the collections were dispersed by sale in 1824. The books were sold by Mr. Evans of Pall Mall in three parts, commencing on the 11th of May and continuing until the 28th of June. The total amount realised was eighteen thousand seven hundred and twenty-nine pounds, sixteen shillings. The prices obtained were by no means high. The Gutenberg Bible, which was a very fine one, fetched less than two hundred pounds, and the copy of the Mentz Psalter, for which Mr. Quaritch subsequently gave four thousand nine hundred and fifty pounds at Sir J. H. Thorold's sale in 1884, sold for one hundred and thirty-six pounds, ten shillings. The Latin Bible of 1462 was disposed of for the same sum; and the unique vellum Livy, which cost Sir Mark nine hundred and three pounds at the sale of Mr. Edwards's books in 1815, realised but four hundred and seventy-two pounds, ten shillings. This volume was bought by Messrs. Payne and Foss, who sold it to Mr. John Dent, and at the sale of his collection in 1827 it was acquired for two hundred and sixty-two pounds, ten shillings by the Right Hon. Thomas Grenville, who bequeathed it to the British Museum in 1846. The three manuscripts mentioned—The Office of the Virgin Mary, the Report of Convocation on Henry VIII.'s divorce from Anne of Cleves, and Dugdale's Visitation of the County of York—fetched respectively one hundred and sixty-three pounds, sixteen shillings; two hundred and fifteen pounds, five shillings; and one hundred and fifty-seven pounds, ten shillings.

Sir M. Masterman Sykes was one of the original members of the Roxburghe Club, and in 1818 printed for presentation to the members a portion of Lydgate's Poems. He was the 'Lorenzo' of Dibdin, who describes him as 'not less known than respected for the suavity of his manners, the kindness of his disposition, and the liberality of his conduct in all matters connected with books and prints.'