Background
According to his name he was born or came from the village of Siekluki in Mazovia, near Radom.
linguist publisher theologian translator
According to his name he was born or came from the village of Siekluki in Mazovia, near Radom.
Little is known about his early life. Originally Seklucjan was a Dominican. After studying at Leipzig he moved in around 1543 to Poznań, where he served as a Lutheran preacher.
Threatened by the local bishop with a charge of heresy, in 1544 he moved to Königsberg (Królewiec, today Kaliningrad) in Ducal Prussia, at the time a fief of the Kingdom of Poland.
There he lived under the protection of Duke Albert of Prussia and began publishing and printing Lutheran literature in the Polish language. He was encouraged in his endeavors by Duke Albert, who wanted to have the Bible and catechism translated into the vernacular language of his many Polish subjects.
He was in charge of the parish of the church in Steindamm (part of Königsberg), which served as a local center for Lutheran Poles.