The Virgin of Jasna Gora in Czestochowa is Queen of Poland

“So many times we came here to this holy place with attentive pastoral ear, to listen to the beating of the heart of the Church and of that of the motherland in the heart of the Mother. Jasna Gora is, in fact, not only a place of pilgrimage for the Poles of the motherland and of the whole world but also the nation's shrine.

One must listen in this holy place in order to hear the beating of the heart of the nation in the heart of the Mother. For her heart beats, we know, together with all the appointments of history, with all the happenings in our national life: how many times, in fact, has it vibrated with the laments of the historical sufferings of Poland, but also with the shouts of joy and victory! The history of Poland can be written in different ways; especially in the case of the history of the last centuries, it can be interpreted along different lines. 

But if we want to know how this history is interpreted by the heart of the Poles, we must come here, we must listen to this shrine, we must hear the echo of the life of the whole nation in the heart of its Mother and Queen. […]

The last decades have confirmed and intensified that unity between the Polish nation and its Queen. Before the Virgin of Czestochowa there was pronounced the consecration of Poland to the Immaculate Heart of Mary on 8 September 1946. Ten years later the vows of King Jan Kazimierz were renewed at Jasna Gora on the 300th anniversary of the time when he, after a period referred to as one of deluge (the seventeenth-century Swedish invasion), proclaimed the Mother of God Queen of the Polish Kingdom.”

John Paul II, apostolic journey to Poland, Holy Mass and act of consecration to the Mother of God, Jasna Gora, June 4, 1979 (Homily excerpt)

https://www.vatican.va/content/john-paul-ii/en/homilies/1979/documents/hf_jp-ii_hom_19790604_polonia-jasna-gora.html