Le Ksar was a big, "workmanlike"[2] bay horse standing 16 hands 2½ inches high[3] bred in France by Leon Volterra.
[6] Ksar was a representative of the Byerley Turk sire line,[7] unlike more than 95% of modern thoroughbreds, who descend directly from the Darley Arabian.
[9] Le Ksar was unraced as a two-year-old and made his debut in the Prix Juigné over 2000 metres at Longchamp Racecourse in April 1937 in which he finished second to Chesham.
[15] Le Ksar was towards the rear of the field throughout the race, ran very wide on the final turn, and finished unplaced behind Mid-day Sun.
[19] Despite the death of Frank Carter at the end of 1937,[20] Le Ksar remained in training as a four-year-old but failed to win any major races.
* Le Ksar is inbred 4S x 3S to the stallion Omnium II, meaning that he appears fourth and third generation on the sire side of his pedigree.