Stegmann Joachim,  Junior, was the son of Joachim Stegmann, Senior; the son-in-law of Martin Ruarus; and the brother of Christopher Stegmann, Junior. In the year 1644, he was appointed assistant to John Stoinius at Uszomir and Szersznie; and in the year following was ordained by the Ministers of Volhynia, and became ordinary Minister of the Church of Uszomir. In 1649, he undertook the pastoral charge of the Church of Czarcow for a twelvemonth. G. F. Redoch, in a Letter published by Boysen, in the " Allgem. Hist. Magaz.," (Pt. i. p. 387,) says, that in 1652 he lay concealed at Hamburgh. In the following year we find him presiding over the Church at Siedliski; and we learn, from a Letter of Ruarus to Stephen Curcellaeus, inserted in the "Epistles of the Remonstrants," (No. 609,) that he was living with the former near Dantzic in 1657. In that year Ruarus died; and in 1663 his son-in-law, Stegmann, after attending the Synod held at Kreutzburg on the first of March in that year, accompanied Andrew Wissowatius to Manheim, with whom he undertook the joint pastoral charge of the Church of the Polish exiles, collected in that city. After an interval of two or three years thus spent, he settled at Clausenburg in Transylvania, where he became Minister of the Saxon Unitarian Church, and died in the year 1678, at the age of sixty. Reinhart informs us, that he assumed the name of Eleuiherius Philalethes. The following is a list of his writings.

1. A Brief Inquiry between the two parties of Disputants respecting the Doctrine of the Trinity, to which of them, at length, after their protracted Contests, the Victory should he awarded? 1640, 8vo. This was mentioned under Article 315, (No. 13,) as having been published by Stegmanii, under the anagrammatical designation, Magnus Amicus Honesti. Bartholdus Feind replied to it in a little work, entitled, "Trifles of a certain Socinian dissipated. Lubeck, 1668."

2. A Brief Demonstration of the Truth of the Christian Religion; subjoined to Daniel Brenius's Dialogue upon the same subject. (VideArt. 223, No. 4, k.)

3. A Paper written in 1640, and addressed to the Senate of Rostock, by Magnus Amicus Honesti.

4. Preface to an enlarged edition of "The Catechism of the Polish Churches," published in 1665, 8vo., and again in 1680, 4to. The subject of this Preface is the right of private judgment in religious matters; and it was the joint production of Andrew Wissowatius and Joachim Stegmann.

5. Two Letters to Stanislaus Lubieniecius, inserted in that author's "Theatrum Cometicum." (Pt. i. Fol. 597, seqq.)

6. The Commentaries of J. L. Wolzogenius rendered out of German into Latin, and forming the 6th Vol. of the Bibl. Fratr. Polon.

7. A Letter to J. L. Wolzogenius on the Question concerning Abiathar and Ahimelech; subjoined to that author's Commentary on Mark ii. (Bibl. Fratr. Polon. T. VI. Fol. 460—462.)

8. Commentary on John vi.—x.; forming part of the Commentary of J. L. Wolzogenius. (Vide Bibl. Fratr. Polon. T. VI. Fol. 788—926.)

9. On Magistracy, War, &c. MS.

10. A Treatise against Daniel Zwicker on the same subject. MS.

11. Against Atheists. MS. This was written at the Assembly of Raszcow in 1655, and submitted for revision to Jonas Schlichtingius.

12. A Disquisition on the certain Foreknowledge of God from Eternity respecting future Contingencies. MS. This was probably the anonymous treatise " De Praescientia Futurorum Contingentium," mentioned by Sandius, (B. A. p. 178,) and is supposed by Bock to have been written in reply to Daniel Zwicker, who had a controversy on this subject with Andrew Wissowatius.

13. On the Church of Christ, and its Authority. This also is referred to by Sandius, ubi supra.

14. The Question, Whether the Public Exercise of Religion ought to be omitted on Account of Dangers? MS.

15. On the Washing of the Feet, against Jonas Schlichtingius.

16. An Apology for the Sect of the Arians (as they are commonly called) condemned in the General Diet at Warsaw, A. D. 1658. MS.

17. The Use of Right Reason in Matters of Faith, defended against John Andrew Schubert's Philosophical Dissertation concerning Nature, or the Essence of the Light of Nature or Right Reason, and its Difference from the Light of Revelation. Altorf, 1662. A manuscript copy of this treatise formerly existed in the library of D. E. Jablonski. Some have attributed it to Joachim Stegmann, the elder; but if the above date is correct, it is chronologically impossible that he should have written it, as he died in 1633. Bock's remark, that it was composed in defence of the elder Stegmann's treatise " On the Use of Reason in Matters of Religion," seems not improbable. (VideArt. 212, No. 2.)

18. Antikesler. Stegmann was strongly urged to undertake this work at the Synod of Siedliski, in 1653. A similar work had been undertaken, and partly composed by Peter Morscovius, some years before.

19. A History of the Polish Churches. Lat. Whether Stegmann ever wrote this work seems doubtful. He was requested to do so at the Assembly of Daszow in 1646; and again at the Assembly of Raszcow, in 1649 and 1650.