The château at Meillant is not a Loire Valley castle. It's located in the old Berry province, not the Loire Valley. Meillant in the Cher River Valley about 150 km/90 miles upstream from Saint-Aignan.
The château was built in the early 1300s and in 1453 was acquired by Pierre of Amboise, a nobleman who was the lord of Chaumont-sur-Loire, near Blois. The original building was fortified, as medieval castles tended to be. Pierre's son Charles 1er d'Amboise, who was at one time the governor of the Paris region, Champagne, and Burgundy, set out to renovate and "modernize" the Meillant château, but he died at the age of 51, before the work could be done. It was his son, Charles II d'Amboise, who finished the job in the late 1400s and early 1500s.
Meillant shows two faces to the visitor. The southwest front is medieval, with massive towers facing a moat. The northeast façade is highly ornate, showing its architectural kinship with the Renaissance châteaux of the Loire Valley.
The style is late gothic, called "flowery" gothic. Charles II spent time in Italy, where he was the governor of Milan. So it has been said that "Milan made Meillant," in the sense that Charles II brought back from Italy the ideas for the renovations he ordered at the old castle.
The château de Meillant was also completely restored much later, in 1842.
The main tower, highly ornamented, is called the Tower of the Lion, because there is a big lion made of gilded lead at its very top. The lion is the work of the Italian Giocondo, who worked with Michelangelo.
CHM and I spent about an hour walking around the château and taking pictures Thursday morning. I just counted my pictures, and it turns out that I took 87 of them. I can't post them all, at least not today! But here's a selection, mostly of details of the decorations on the walls of the château.