Slavata's father belonged to the community of the Bohemian Brethren, and he was himself educated in the doctrines of that Church. He afterwards proceeded to Italy for the purpose of study. He there joined the Roman Church, which obtained in him a most able and enthusiastic adherent. With the proverbial zeal of a convert, he, almost alone among the Bohemian nobles, refused to affix his signature to the celebrated "letter of majesty," by which King Rudolph, in 1609, granted, in agreement with the Estates, considerable rights and privileges to the Protestants. When the weak and sickly King Matthew, during the last years of his life, fell more and more under the influence of his heir, Archduke Ferdinand of Styria, Slavata rapidly obtained high office. He held the office of Lord Chief-Justice at the beginning of the Bohemian troubles in 1618. On the memorable day of the defenestration, Slavata was thrown from the windows of the Hradčin together with his colleague, the burgrave of the Karlstein, Martinic, Lord of Smečno. After the re-establishment of the Habsburg dynasty in Bohemia, Slavata was rewarded for his fidelity by the victors. He held various important offices of state under the Emperors Ferdinand II. and Ferdinand III., and was one of the most trusted councillors of both these sovereigns. His literary work is an incidental and accidental episode in his momentous career. When accompanying the Emperor Ferdinand II. to Regensburg in 1636, a pamphlet written by his old antagonist, Count Thurn, came into Slavata's hands. It dealt with the recent assassination of Wallenstein,[138] but Thurn's pamphlet went far beyond the immediate subject, and, in fact, contained a defence of the author's political career. Slavata immediately resolved on refuting this work, written by the originator of the defenestration. Though sixteen years had passed since that event, and both Bohemian Protestantism and Bohemian independence had been totally suppressed, the memory of his ignominious exit from the windows of the Hradčin still rankled in Slavata's mind. It should also be mentioned that several of his friends, his old companion Martinic in particular, had previously urged him to write memoirs of his time; he had, however, always declined to do so because of the stress of public business.