Not much is known about his life. He married Françoise La Rouge, the daughter of the Paris printer Guillaume Le Rouge, whose workshop he took over on Le Rouge's death in 1517. When a series of condemnations of evangelical works and a ban on Bible translations were issued in Paris in 1525, he moved to Antwerp. In his Antwerp publications he adapted his name to the language of the publication. He died in Antwerp in 1536. After his death, his widow continued to run the workshop.
Publications
De Keyser issued many works by the French humanist Jacques Lefèvre d'Étaples: his French Psalter, his French Old Testament, his French New Testament and his complete French Bible, the first French Bible ever in print. De Keyser published the second edition of Lefèvre's fivefold Psalter, the Quincuplex Psalterium, which contained the Psalms in five different Latin versions. His Dutch publications included New Testaments, Psalters, partial biblical translations and other religious works. His printer's device is included in the second complete Dutch Bible, published by his colleague Willem Vorsterman in 1528 in Antwerp, hinting at some kind of co-operation between the two printers working in the same street. Merten de Keyser was active in the English market, too. In 1528 he published William Tyndale's The obedience of a Christen man, and in 1530 Tyndale's The practyse of Prelates as well as Tyndale's translation of the Pentateuch. A year later he issued Tyndale's Exposition of the fyrste Epistle of seynt Ihon, George Joye's translation of Isaiah, and Tyndale's translation of Jonah, the latter two apparently intended as a twin-publication. Thomas Abell's Invicta Veritas, criticizing Henry VIII's divorce, saw the light of day also in the workshop of Merten de Keyser in 1532. In 1533, he posthumously printed John Frith's answer to Thomas More, which Frith composed while imprisoned in the Tower of London. In 1534 De Keyser printed the second, revised edition of Tyndale's New Testament as well as Joye's fresh edition of the Davids Psalter based on Zwingli's Latin Psalter, and Joye's translation of the book of Jeremiah. These Old Testament translations were the first English translations of these biblical books ever in print. Furthermore, according to the discovery of Guido Latré in 1997, it was also Merten de Keyser who printed the first complete English Bible, the Coverdale Bible. Among de Keyser's Latin publications, we find Robert Estienne's Latin Bible, a scholarly revision of the Vulgate based on various ancient manuscripts. Reprints of Erasmus's Latin translation of the New Testament were also issued by de Keyser. De Keyser seems to have published at least one book also in Leuven in 1532.
