Jan Mączyński

Mączyński was the author of a Polish-Latin Dictionary published around 1564 with 1000 pages and 20,500 Latin terms, including idioms and jargon, and their Polish equivalents.

His father was Piotr Zajączek and his mother Anna née Ciemińska, but since his grandfather acquired the town of Mączniki, Jan was called "Mączyński".

He also took part in the Synod of Bełżyce[8] and the 1560 Sejm in Warsaw where, together with Andrzej Frycz Modrzewski, Mączyński argued for ecumenism and religious tolerance.

The dictionary "Lexicon Latino Polonicum Ex optimis Latinae Linguae Scriptoribus Concinnatum” ran 1000 pages and contained 20,500 Latin terms, including idioms and jargon, and their Polish equivalents.

[2] Mączyński may also have contributed Polish translation equivalents to the Basel edition of a dictionary issued in 1590 under the name of the Italian lexicographer Ambrogio Calepino.