Even as to the date of his birth, there is considerable uncertainty. Orlers, a burgomaster of Leyden, in a description of that town published in 1641, and therefore while not only Rembrandt himself but many people who must have remembered his birth were still alive, states that Rembrandt, the son of Hermann, the son of Gerrit, and Neeltje, the daughter of Willems of Suydtbroeck, was born on the 15th of July 1606, and later writers for more than two hundred years accepted his assertion without question. Dr Bredius has, however, shown that on May 25th, 1620, Rembrandt was entered as a student in the Faculty of Letters at the University of Leyden and his age is given in the same document as fourteen, _Rembrandt Hermanni Leidensis 14 jare oud_, and as this was before his birthday in that year the question arises as to whether the statement means that he was in his fourteenth year or that he had passed the fourteenth anniversary of his birthday. For, the day of his birth not being in dispute, if we take the latter and more obvious interpretation it would necessarily follow that the fourteenth anniversary was in 1619 and that he completed his first year on 25th May 1606, so that the actual day itself must have been in 1605. There is further and still conflicting evidence to be reckoned with. In the British Museum there is a proof of an etched portrait of himself dated 1631 [B. 7], on which is written, in what is believed to be his own hand, "_aet._ 24, 1631." If this was written before the 15th of July it would point to 1606 as his birth year, thus agreeing with Orlers' statement, while if it was written after that day it would imply 1607. It should, however, be observed that M. Blanc reads the figures on the etching as 25, and if he be correct in this the choice must lie between 1607 and 1608; while, to add further to the mystification, Mr Sidney Colvin reads the age as 27, which makes the birth year 1603 or 1604.
Nor is 1607 without further support. Dr Scheltema discovered in the marriage register of Amsterdam the record of Rembrandt's official engagement to duly obtain his mother's consent to his marriage, signed by himself, and in this he gives his age on July 10th, 1634, as twenty-six, in which case his birthday would have fallen in 1607, but we know that he was at all times very vague as to dates and figures. On a delightful pencil drawing on vellum, in the Berlin Museum, of his wife Saskia, there is an inscription in his handwriting "Dit is naer myn huysfrow geconterfeit do sy 21 jaer oud was den derden dach als wy getroudt waeren due 8 junyus 1633"--"This is a portrait of my wife when she was 21 years old, on the third day after our marriage, the 8th of June 1633," a simple statement, which nevertheless contains a remarkable number of errors for so brief a document. Saskia, it is true, was twenty-one in 1633, but the marriage took place on the 22nd of June and in the year 1634.