Caper John , Jun., was the son of John Caper, Minister of Smigel, who called himself Koselski, which is the Polish for Caper. John Caper, Jun., and Daniel Caper are mentioned in the Synodical Acts of 1619 and 1620, among the theological students on the foundation at Racow. Crellius, in the letter to Ruarus, dated Racow, July 19^th, 1624, writes thus concerning John Caper. "As far as regards our School, Mr. Caper, of Smigel, who has taken the name of Kozelski, and of whom I have heard something before, came to us twelve days after you left. Hitherto he has been among the Catholics, contrary, as he admits, to his own convictions. He was two years at the University of Frankfort, and a third in that Strasburg, at the expense of the Bishop of Plock, who appointed him tutor to his nephews. He comes to us with the  intention of studying Theology among us, with what view may easily imagined. We have not thought proper  to repulse him, especially as his literary attainments are by no means inconsiderable, and he speaks Latin fluently and correctly: nor do we intend to maintain him as a theological student, and hold out to him any certain hope of his being ordained to the ministerial office ; nor yet to support him in idleness. Till the question of the Rectorship is settled, therefore, we have engaged him provisionnally to take the first class in our School ; to lecture on Logic, Rhetoric, and the Orations of Cicero ;  and to give out, and correct exercices in compositions ;  the superintendence of the Ethical Class devolving, in the mean time, upon our dear brother Sclichtingius. The number of hours is increased to the students, five being substituted for the three spent in School, besides Sundays and Wednesdays. Christopher Lubieniecius has commited his brothers to him, for which he is to have fifty florins per annum. We have promised him a hundred for his labours in the School ; and have held out to him a hope, that, if he attends to his duties, the Synod may assist him. When he was introduced to the School, six imperial dollars were presented to him by way of gift. Thus far he seems to have performed his duties properly : but he has charge of the first class, on the same condition that the other Tutors have theirs ;  and is neither called, nor acts as Vice-Rector. His disposition is agreeable. I am unable to say anything as to his character."