Question: When was Brest Bible published?
About the article "Protestant Reformation", section "Polish – Lithuanian Commonwealth".

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The Brest Bible () was the first complete Protestant Bible translations into Polish, published in 1563 in Brest and dedicated to King Sigismund II Augustus.
Polish full original title: "Biblia święta, Tho iest, Księgi Starego y Nowego Zakonu, właśnie z Żydowskiego, Greckiego, y Łacińskiego, nowo na Polski ięzyk, z pilnością y wiernie wyłożone."
Jan Seklucjan (1510–1578), preacher at Königsberg, was commissioned to prepare a translation, and he published the New Testament at Königsberg in 1551 and 1552.
The Polish Reformed (Calvinists) received the Bible through Prince Nicholas Radziwill (1515–65).
A company of Polish and foreign theologians and scholars undertook the task, and, after six years' labor at the "Sarmatian Athens" at Pińczów, not far from Kraków, finished the translation of the Bible which was published at the expense of Radziwill in Brest-Litovsk, 1563 (hence called the Brest Bible "Biblia Brzeska").
The translators state that for the Old Testament they consulted besides the Hebrew text the ancient versions and different modern Latin ones. 
The Brest Bible was superseded by the so-called Danzig Bible (or Gdańsk Bible), which finally became the Bible of all Evangelical Poles.
At the synod in Ożarowice, 1600, a new edition of the Bible was proposed and the work was given to the Reformed minister Martin Janicki, who had already translated the Bible from the original texts.
In 1603 the printing of this translation was decided upon, after the work had been carefully revised.
The work of revision was entrusted to men of the Reformed and Lutheran confessions and members of the Moravian Church (1604), especially to Daniel Mikołajewski (d. 1633), superintendent of the Reformed churches in Great Poland, and Jan Turnowski, senior of the Moravian Church in Great Poland (d. 1629).
After it had been compared with the Janicki translation, the Brest, the Bohemian, Pagnini's Latin, and the Vulgate, the new rendering was ordered printed.
The Janicki translation as such has not been printed, and it is difficult to state how much of it is contained in the new Bible.
The New Testament was first published at Danzig, 1606, and very often during the 16th and 17th centuries.
The complete Bible was issued in 1632, and often since.
The Danzig Bible differs so much from that of Brest that it may be regarded as a new translation.
It is erroneously called also the Bible of Pavel Paliurus (1569—1632) (a Moravian, senior of the Evangelical Churches in Great Poland, d. 1632); but he had no part in the work. 
He was one of the team which produced the Brest Bible 1558-1563.
He wrote the first grammar of Polish, "Polonicae grammatices institutio" (1568). 
Two years after the Brest Bible was completed the Calvinist and Radical wings of the Reformed church split in 1565, and the Bible was suspect to both groups: The Calvinist "Ecclesia Major" suspected it of Arian interpretations; the Radical "Ecclesia Minor" complained that it was not accurate enough.
Symon Budny, a Byelorussian of the Judaizing wing of the "Ecclesia Minor" especially charged against the Brest Bible that it was not prepared according to the original texts, but after the Vulgate and other modern versions, and that the translators cared more for elegant Polish than for a faithful rendering.
He undertook a new rendering, and his translation ("made anew from the Hebrew, Greek, and Latin into the Polish") was printed in 1572 at Nesvizh.
As changes were introduced in the printing which were not approved by Budny, he disclaimed the New Testament and published another edition (1574) Zasłaŭje, and then finally a third edition (1589) where he withdrew some of his Judaizing and Talmudic readings.
The charges which he made against the Brest Bible were also made against his own, and Budny's former colleague Marcin Czechowic of Lublin - who was concerned with Budny's preference for Hebrew over Greek sources - published the Polish Brethren's own edition of the New Testament (Cracow, 1577).
The interesting preface states that Czechowic endeavored to make an accurate translation, but did not suppress his Socinian ideas; e.g., he used "immersion" instead of "baptism."
A further truly Socinian Racovian New Testament was published by Valentinus Smalcius, a pupil of Fausto Sozzini (Racovian Academy, 1606).