The discovery of a big plot of land along the Sauldre river on the napoleonic land registry
allowed to cut the former debate between the architectural historian Jean Guillaume
and the international specialist of Leonardo, Carlo Pedretti, concerning the size of the palace.
Statement GPS allowed to place exactly the earth-movings of the years 1517-1519.
Archaeological excavations led in April, 2010 and managed by Simon Bryant allowed to locate substructions of limestone proving that a part, at least, of the construction site had been taken care by a royal financing.
The location of a hunting lodge in a forest deprived in the North of Romorantin,
in the said place "le Rond du Roi",
came to contradict the hypothesis of Pedretti of a detached house situated in town attached to the castle.
 "Le Rond du Roi", where 8 paths cut as a giant star, could indeed correspond
with the octagonal building thought by Leonardo.
Finally, a series of statements on the ground of the canal planned between the Sauldre and the Cher rivers
 allowed to make Leonardo's sketches correspond in the curiously right plan
with a brook still existing, called, the "Mabon".
These new data confronted with the sketches of the Codex of Leonardo da Vinci allow us new readings.

The exhibition suggests answering a stabbing question :
why was François Ier's project elaborated with Leonardo abandoned ?
Is it because of an epidemic, as what was often said ? Is it because the King changed his priorities ?
Is it because he did not have enough money ? But then, why he dashes then into the construction site of Chambord ?
 Finally, if Chambord is an alternative solution,
what tracks left the romorantinaise adventure in the palace built by the King builder in the nearby forest ?