The board was published in 2019, on the 450th anniversary of the Union of Lublin. The attractive, stylized form of the publication presents the history and significance of that great event. We presented: – content of the act of the Senate of the Republic of Poland establishing 2019 as the year of the Union of Lublin – a photocopy of the Act of the Union of Lublin in actual size – panorama of Lublin from 1614 – extensive fragments of the original text of the union – a brief historical outline of events related to the Union of Lublin – fragment of the will of King Sigismund II Augustus referring to the Union of Lublin – image of Jan Matejko's painting - Union of Lublin – Map of the Polish-Lithuanian Commonwealth from the 17th century. The board is topped with a wax seal with an eagle, is 98 cm wide and is mounted on decorative bars.