The construction of the castle was carried out at four times. Initially it rests on the old feudal castle of the Counts de Blois. Louis XII made build the north-eastern wing between 1498 and 1508 pennies the direction of Hake Biart, the architect of the Castle of Amboise. The architect of the wing north-western, known as François I, is Dominica de Cortone; the Italian Renaissance marks it. The frontage on court is decorated with a well-known staircase from the Gothic style.
The northern frontage (photo here against) dominates the old valley of Arrou and comprises many galleries and windows. The southwester wing is due to Gaston of Orleans, it remained unfinished.
The castle of Blois was often used as royal residence in XVIth century; it is there that the assassination of the Duke of Own way in 1588 took place.
Louis XIII’s mother, Marie de Medicis was exiled there during two years in 1617.