Bertrand Dulac, lord of Bazoches-les-Gallerandes, purchases the estate of Chamerolles which represents several thousand acres. His son Jean marries Isabeau De Salezard, daughetre of a Captain of Charles VII and Louis XI. This union gives birth to Lancelot, so named in tribute to the chivalrous (romanesque) novel from Chrétien de Troyes, Quest for the holy grail.
As soon as 1494, Lancelot du Lac embarks on the Italian campaigns alongside the Duc of Orléans, future Louis XII. When the latter is appointed to the throne of France in 1498, lancelot is designated governor of Auxerre and the King's cupbearer, then in 1504 he gets the title of governor of Orléans and King's chamberlain. In 1515, François 1st succeeds Louis XII and Lancelot du lac, remaining chamberlain, becomes bailif of Orléans following Guillaume de Montmorency. He marries Louise de Coligny, Gaspard of Châtillon-Coligny's sister, as a second wife in 1519.
François 1st and his suite may have stayed twice at Chamerolles, in 1530 and in 1532, on the way from Chambord to Fontainebleau. Claude, the son of Lancelot and Louis de Coligny, succeeds his dead father in 1536 as the governor of Orléans.
Claude remains faithful to the catholic faith, but Lancelot II du lac, his son, converts to Protestantism and turns the chapel into a temple. Together with his cousin Gaspar de Coligny and alongside Henry of Navarre in Flanders in 1585 he defends the reformed church while Henry III puts the care of the of the castle of Chamerolles in the hands of “Sir de dampierre... captain of fifty men-at-arms”.
Towards the middle of the 17th century, the grandson of Lancelot II leaves his sister Charlotte, Lady of Chamerolles, the legacy of the estate. Married to Jean de Branchoux, lord of Bainvillier, the latter sells the property to Jacques François de Johanne de la Carre, marquis of Saumery, in 1672.
For 235 years, the castle of Chamerolles remains within the du Lac family.