The first baronial residence was built in Blandy in the thirteenth century, in the form of a simple manor with an irregular surrounding wall. Later that century, considerable fortification work was done, particularly the three towers which were added to the fortified entrance tower. A large residential building was built inside these fortifications.
In 1992, the Seine et Marne general council bought the
fortress and undertook a vast
restoration operation. A complete programme of works has enabled this superb fortress to be resuscitated and become one of the leading
tourist attractions in the department.