Castle Lady narrowly got up to give Godolphin a French Classic Guineas double in the Group One Emirates Poule d’Essai des Pouliches, also known as the French 1,000 Guineas, at ParisLonchamp.
Ten three year-old fillies contested this one mile Classic.
Imperial Charm took the field along with Suphala.
The front two set a fairly sedate early pace and turned for home a length ahead of Matematica and Castle Lady.
Imperial Charm kicked for home in the straight and had most of her rivals under pressure.
But Matematica got by and then Castle Lady swept through to lead under Mickael Barzalona.
Castle Lady looked booked for a decisive win however Commes stormed home down the inside to join the Godolphin filly on the line in a very close finish.
East came from off the pace to finish a strong third, with Imperial Charm fourth.
Castle Lady was called the winner, giving trainer Henri-Alex Pantall a first success in the French Classic.
This was another Classic success for Darley stallion Shamardal.
For Godolphin it proved a landmark success, for it was the 300th Group One victory for the team, who first tasted victory at the highest level, when Balanchine landed the 1994 Oaks at Epsom.