At that time, it belonged to the Jedliński family (Nabram coat of arms), and in the second half of the 16th century, Jedlińsk emerged as one of centers of the Protestant Reformation in northern Lesser Poland.
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The town had a Calvinist prayer house, together with a school, which competed with the famous Racovian Academy (see also Polish Brethren).
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The school existed in 1560-1630, and in that period, Jedlińsk attracted many Scottish Calvinists, who founded a bell for the prayer house (the bell still exists).