The castle's strategic value was obvious from the beginning: it commanded the Indre valley from a position roughly 500 meters from the river, its massive square keep visible for miles across the Touraine countryside. Henry II of England and his son Richard the Lionheart occupied Loches during the 12th century, making it a cornerstone of the Angevin empire's holdings in France. The French king Philip II besieged it repeatedly during the wars for control of the French crown, finally capturing it in 1204. Philip immediately upgraded Loches into a formidable military fortress. The 11th-century keep, built by Fulk III, Count of Anjou, still stands as testament to the engineering of that era: four storeys rising 37 meters high, with walls 2.8 meters thick, each floor a single enormous room.

Loches reached its most glamorous period under Charles VII, who made it a favorite royal residence. It was here that he installed Agnes Sorel, granting her a status no woman had publicly held before at the French court. Agnes was celebrated for her beauty, her political influence, and her taste -- she set fashions that the court followed and bore the king four daughters. Her presence at Loches transformed the fortress from a purely military stronghold into something approaching a palace, though the thick walls and defensive towers never let visitors forget what the building was originally for. The chateau's dual identity -- elegant residence wrapped around a military core -- would define it through the Renaissance.

Charles VII's son, Louis XI, had grown up at Loches but preferred the Chateau d'Amboise. He found a different use for his childhood home: converting it into a state prison. The same massive walls and isolated position that had made Loches defensible now made it inescapable. Among its later inmates was the writer Henriette-Julie de Murat, exiled there in 1702 after a scandal involving accusations of lesbianism and other transgressions that had estranged her from her husband and led her mother to disinherit her. The chateau held prisoners of various ranks and offenses through the centuries, its reputation growing darker with each generation. The dungeons beneath the keep became particularly notorious, their cramped stone cells a stark contrast to the royal apartments above.

Today Loches dominates its small town much as it has for a thousand years. The keep remains one of the finest surviving examples of Romanesque military architecture in France, its square profile unmistakable from the air or the ground. The royal apartments, the collegiate church within the fortified enclosure, and the dungeons below create a vertical cross-section of medieval society: prayer, power, and punishment stacked on a single hilltop. The town that clusters at the chateau's base grew up in its shadow and never outgrew it. From the Indre valley, the silhouette of the keep against the Touraine sky looks much as it must have when Richard the Lionheart rode through the gates, or when Agnes Sorel first surveyed her new domain from the windows above.