Marriage
From childhood, Lucrezia's parents sought suitable marriage candidates for their daughters. From 1549 to 1550, it was planned that Lucrezia would be married to Don Pedro de Aragona y Cardona, 3rd Duke of Montalto. Then in 1552 she was betrothed to Fabio Dal Monte, a nephew of Pope Julius III, but the engagement was canceled after the death of the Pope in 1555.
This marriage was a late consequence of the Italian Wars (1494-1559), a series of conflicts fought between the monarchs of Spain and France over the Italian peninsula; the Spanish emerged victorious and former French allies, like the aristocratic Estes, were forced to make a series of concessions as part of the peace treaties. In 1557, as a sign of reconciliation between Ercole II d'Este, Duke of Ferrara (who held a pro-French position), and King Philip II of Spain, it was decided that Alfonso d'Este, Hereditary Prince of Ferrara, would marry Maria de' Medici, the eldest daughter of Cosimo I, an ally of Spain. However, Maria died shortly thereafter and Lucrezia took her place.
The marriage between a prince from the House of Este and a princess from the House of Medici was opposed by a pro-French party at the groom's court. King Henry II of France's sister, Margaret, and daughter, Elisabeth, were suggested instead to the Ferrarese court as wives for the hereditary Prince. And the ambassadors who arrived in Florence from Ferrara, who had not yet seen Lucrezia, had previously heard rumors deliberately spread around the Ferrara court as to her plain appearance and poor health.
Nevertheless, on 13 April 1558, a marriage contract was signed in Pisa, according to which a dowry of 200,000 gold scudi was given for the bride. On 11 May Alessandro Fiaschi, the chief representative of Ferrara, presented a ring to Lucrezia as a sign of the betrothal. The ambassadors saw her then for the first time and were pleased with the appearance of the princess. She seemed to them a well-mannered and virtuous girl.
Alfonso d'Este solemnly entered Florence on 18 May 1558. On 3 July, 24-year-old Alfonso and 13-year-old Lucrezia were married in the chapel in the Palazzo Pitti (or according to another version in the Basilica of Santa Maria Novella), by the bishop of Cortona, Giovan Battista di Simone Ricasoli. At the request of his mother-in-law, the hereditary Prince of Ferrara agreed to postpone the wedding night until such time as his bride reached sexual maturity.
According to an oral agreement between Alfonso and his father-in-law, which they reached at the conclusion of the marriage contract three days after the wedding, Alfonso left Florence. He went to the French court in Paris, who promised to pay off a sovereign debt to the Duchy of Ferrara of 300,000 ducats. Lucrezia, despite the invitation of her father-in-law to move to Ferrara, remained in Florence at the request of her mother, to wait for her husband to come for her.
Together with her sister Isabella, the new hereditary Princess of Ferrara continued to live in the chambers of the Palazzo Pitti, isolated from the rest of the world. Lucrezia's numerous letters to her husband often went unanswered. While waiting for Alfonso to come to her, she ate almost nothing and spoke little, and every day she prayed for him for a long time at the morning service. The hereditary Princess desperately wanted to leave her strict maternal care and start an independent life.
After some time, Duke Cosimo I expressed dissatisfaction to his son-in-law at the manner in which he was delaying his return to collect his wife. Only after the death of Duke Ercole II on 3 October 1559, when Alfonso became Duke of Ferrara, Modena and Reggio under the name of Alfonso II, and his spouse became, accordingly, Duchess consort, did he leave France and come to retrieve her. On 17 February 1560, Lucrezia moved out of the Medici court in Florence and entered Ferrara.