Described by John Evelyn as:
Thence to Essone, a house of Monsieur Essling who is a great virtuoso; there are many good paintings in it; but nothing so observable as his gardens, fountains, fish-pools, especially that in a triangular form, the water cast out by a multitude of heads about it; there is a noble cascade and pretty baths, with all accommodations. Under a marble table is a fountain of serpents twisting about a globe.
The house closely fits the description of the “Château de Courances”, a grand 16th century house with extensive gardens and water features in Essonne.
Unconfirmed location at this time.