The Prix Isonomy is a Listed flat horse race in France open to two-year-old thoroughbreds.
It is run at Deauville over a distance of 1,600 metres (about 1 mile), and it is scheduled to take place each year in October.
The event is named after Isonomy, a successful racehorse in the late 19th century.
For a period it took place in late October or early November.
It started a longer spell at Saint-Cloud in 2005, and was switched to Chantilly in 2012.