It is only fitting, since His Holy Mother, as Our Lady of Częstochowa, also known as the 'Black Madonna',has been Queen of Poland since 1652.
The Black Madonna is said to have miraculously saved the monastery of Jasna Góra (English: Bright Mount) from a Swedish invasion. The Siege of Jasna Góra took place in the winter of 1655 during the Second Northern War, as the Swedish invasion of the Polish-Lithuanian Commonwealth is known. The Swedes were attempting to capture the Jasna Góra monastery in Częstochowa. Seventy monks and 180 local volunteers, mostly from the szlachta (Polish nobility), held off 4,000 Swedes for 40 days, saved their sacred icon and, according to some accounts, turned the course of the war. This event led King John II Casimir Vasa to crown Our Lady of Częstochowa as Queen and Protectress of Poland in the cathedral of Lwów on April 1, 1656.
On 1 April 1656, during a holy mass in Lwów's Cathedral, conducted by the papal legate Pietro Vidoni, John Casimir in a grandiose and elaborate ceremony entrusted the Commonwealth under the Blessed Virgin Mary's protection, whom he announced as The Queen of the Polish Crown and other of his countries. He also swore to protect the Kingdom's folk from any impositions and unjust bondage.
From Rorate Cæli
It's official: Christ, the King of Poland!
The Lord Jesus Christ Recognized as the King of Poland