Following the death of Cecilia Renata in 1644,
Cardinal Jules Mazarin was determined to weaken the alliance between the Polish-Lithuanian
Vasa dynasty and the Austrian
Habsburg dynasty, the rivals of the French state. Mazarin insisted for Marie Louise to marry the widowed sovereign, making sure that she was the only candidate. from the collection of the
National Gallery of Art Under the pressure of the French government and other
Western nations, Marie Louise Gonzaga finally married Władysław by proxy on 5 November 1645. The proper wedding of Marie Louise and Władysław IV took place in
Warsaw on 10 March 1646. She was forced by the Commonwealth's parliament (
Sejm) and the strongly zealous nobility to change her name from Marie Louise to Ludwika Maria for the marriage to take place, as the given name
Maria was then considered in Poland reserved only for
Mary, mother of Jesus.
Stefan Czarniecki in
Chojnice, 1657 Two years later, on 20 May 1648, Marie Louise was
widowed by the sudden death of Władysław IV.
John Casimir was eventually elected the next King of Poland and Grand Duke of Lithuania by the parliament, and married her on 30 May 1649. During an 18-year marriage with John Casimir, she gave birth to two children, Maria Anna Teresa and John Sigismund, who died in infancy. Queen once more, Marie Louise immediately focused on influencing the political views of her new husband. Marie Louise believed that she was more able to control John Casimir rather than his
deceased brother Władysław, who was described as extremely stubborn, self-centered and overwhelmingly supporting the nobility. In contrast, Marie Louise opposed the nobility and sought to weaken their power in Parliament. Intelligent, tenacious and with a strong personality, she guided John Casimir throughout his political and military campaigns. This was noticed by a
Brandenburgian diplomat, Hoverberk, who stated in his diaries that "by incessant insistence, molestation, complaints and other tricks she controlled the poor king and therefore the entire ill-fated country itself." In contrast to her husband, Marie Louise was reportedly not sympathetic towards the servants, peasants and lower classes but sought to strengthen the Polish-Lithuanian nation in case of war against the powerful and dangerous eastern empires: the
Ottoman Empire, the
Swedish Empire and the
Russian Empire. Marie Louise was an active and energetic woman, with ambitious economic and political plans for the Polish–Lithuanian Commonwealth. The
Polish-Lithuanian nobility were shocked at the queen's political meddling and believed that foreign women should not interfere in politics. Nevertheless, she played an instrumental role in leading Poland and Lithuania in repulsing the Swedish during the
Swedish invasion of the Commonwealth, commonly known as the "Deluge". She attempted to change the voting system of the Polish Senate in order to grant the king more power, but she was unable to do so, as such actions threatened a rebellion of the upper classes that could have devastated the economy of the Commonwealth. Marie Louise opposed the Commonwealth's policy of religious toleration, believing that Poland was a "place of shelter for heretics" and wanted them burnt at the stake. Marie Louise made use of bribery and false promises to the
aristocracy in order to achieve her goals. She brought many noble ladies to the Polish-Lithuanian court from France who would be obliged to marry
voivodes, princes and wealthy landowners and eventually serve as a defensive shield if the higher classes decided to rebel against the government, one of the most well-known examples of this strategy being her relative and favourite
Klara Izabella Pacowa. Marie Louise also strongly followed French cultural patterns and introduced new French customs to the Commonwealth. She was known to wear only French clothing and to collect small memorabilia like coins, jewellery and perfume bottles, which was a common practice during the reign of
Louis XIII and subsequently
Louis XIV. ==Swedish invasion and hope for victory==