Milton's interesting German friend, Henry Oldenburg, had recently removed from London to Oxford. "In the beginning of this year," says Wood in his _Fasti_ for 1656, "studied in Oxon, in the condition of a sojourner, HENRY OLDENBURG, who wrote himself sometimes GRUBENDOL [anagram of OLDENBUBG]; and in the month of June he was entered a, student by the name of _'Henricus Oldenburg, Bremensis, Nobilis Saxo'_: at which time he was tutor to a young Irish nobleman, called Henry O'Bryen [son of Henry, Earl of Thomond], then also a student there."[1] As we construe the case, Oldenburg, having been for some years in England as agent for Bremen, had begun to see that he was likely to remain in England permanently; and he had gone to Oxford for the benefit of a year of study there with readings in the Bodleian, and the society more especially of Robert Boyle, Wilkins, Wallis, Petty, and the rest of the Oxford colony or offshoot from the _Invisible College_ of London. Desirable on its own account, this migration to Oxford had been made easier to him financially, if it had not been, occasioned, by the arrangement that he should be tutor there to the young Irish nobleman whom Wood names. But this young nobleman was not to be Oldenburg's only pupil at Oxford. Though Wood does not mention the fact, there went with him thither, or there speedily followed him thither, to be also under his charge, another young Irish nobleman. This was no other than, our own Richard Jones, son of Viscount and Lady Ranelagh, the Benjamin among Milton's pupils. Whatever had been the nature of Milton's recent instructions of the youth, they had now ceased, and Oldenburg was to be thenceforward the youth's more regular tutor. It does not seem to have been intended that young Ranelagh should formally enter a college, so as to receive the usual education at the University, but only that he should obtain some acquaintance with Oxford and its ways, and be for a while in the society of his uncle Boyle, and of his two cousins, Viscount Dungarvan and Mr. Richard Boyle. If these two sons of the Earl of Cork were still under the tutorship of Dr. Peter Du Moulin, Oldenburg and Jones at Oxford must have come necessarily also into constant intercourse with that very secret admirer of Milton. Oxford, we do gather, was still Du Moulin's head-quarters; but he was so much on the wing thence that Oldenburg might expect to succeed him in the tutorship of at least one of the young Boyles. Oldenburg was then thirty years of age, and young Ranelagh about sixteen. [Footnote 1: Wood's Fasti, II. 197.] Among four letters to young Jones or Ranelagh included in Milton's Latin Familiar Epistles one is undated. It is put second of the four in the printed collection, but it ought to have been put first. It is Milton's first letter to the youth in his new position at Oxford under Henry Oldenburg's charge. The date may be in or about May 1636:-- "To the Noble Youth, RICHARD JONES.