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In page Isabella d'Este:

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In 1480, at the age of six, Isabella was betrothed to the eight years older Francesco, the heir to the Marquess of Mantua. The Duke of Milan requested her hand in marriage for his son, Ludovico, two weeks later. Instead, her sister, Beatrice was betrothed to Ludovico and became the Duchess of Milan. Her dowry amounted to 25,000 ducats.[1] Although he was not handsome, Isabella admired Francesco for his strength and bravery; she also regarded him as a gentleman. After their first few encounters she began to enjoy his company and she spent the next few years getting to know him and preparing to be the Marchioness of Mantua. During their courtship, Isabella treasured the letters, poems, and sonnets he sent her as gifts.[citation needed]