According to her Wikipedia article, while Henri II was married to Catherine de Medici, he took time off with Filippa Duci. Diane de France was the result. Diane was married in 1553 and lost her husband in battle the same year. She was married to the unwilling François, Duc de Montmorency, in 1557. He died in 1579, succeeded by his brother in the absence of an heir. She became a favorite of Henri III and was respected in the court of Henri IV, trusted to superintend the education of Henri IV's son Louis (XIII).