Conquérant was a founding stallion of the French Trotter horse breed, born in 1858 in Cotentin, Normandy, to breeder Pierre Étienne Joseph-Lafosse, and died in 1880.

Son of the mare Élisa and the stallion Kapirat, descended through him from the almost Thoroughbred Young Rattler, he had an excellent racing career in mounted trotting for the Basly stable.

Contemporary sources on Conquérant are mainly compiled in Les trotteurs, origines, performances et produits (1864) by hippologist and stud inspector Charles Du Haÿs (1818–1898).

In 1869, breeder Joseph-Lafosse sold his entire stable, keeping only Conquérant's dam, Élisa, who finally died of old age on November 20, 1881.

[6][17] On this occasion, he left a letter, found and reproduced by archivist Alain Talon:"My poor old and good mare Élisa, Conquérant's mother, the first and fertile source of our Normandy trotters died this morning.

– Pierre Étienne Joseph-Lafosse, letter dated Sunday November 20, 1881[18]La France chevaline announced Conquérant's death in its September 18, 1880 issue.

[10][20] Édouard Nicard describes Conquérant and his son Reynolds as stallions with slightly drowned backs, a conformation typical of trotters of the period.

[23] Charles Du Haÿs considers him "the most beautiful son of the stallion Kapirat", endowed with magnificent gaits that he passes on to his foals.

[46] Élisa's maternal grandmother may have been the mare La Panachée, born in 1819 at Médavy in the Orne region, then acquired by the royal stables of Charles X in 1825, which were dispersed following the Revolution of 1830.

[6][47] Panachée was covered in Anjou by the Thoroughbred stallion Marcellus, giving birth to the mare Élise, dam of Élisa.

[6] The French Infochevaux database cites the mare Élise, daughter of Marcellus and La Panachée, as Élisa's dam.

[6] In 1896, Paul Guillerot wrote that Conquérant "was a sire of superior merit, and he endowed France with so many outstanding trotters [...] that he must be considered one of the most illustrious heads of the French trotting breed".

[53] In Les familles de trotteurs (1908), Louis Cauchois, places Conquérant at the top of the list of five great sires at the origin of the French Trotter,[54] as does Albert Viel in 1923,[47] and then the Que sais-je?

[13] The Bulletin de la Société d'encouragement pour l'industrie nationale of 1900 lists Conquérant among the six stallions that have "contributed most to the improvement of the Norman breed since 1840".

[58] It is above all the mare Capucine, born in 1880 by Fortuna, who is considered the most famous daughter of Conquérant according to Alfred Gallier (1900),[59] with a kilometer reduction of 1'35''[60] and earnings of 127,127 francs during her racing career.

[15] The chestnut Beaugé,[74] one of Conquérant's coalts by Miss-Ambition,[75] born in 1879,[74] died prematurely after three breeding seasons at the Haras Nationaux.

[52] He justifies this on the grounds that each of these two stallions has "sired trotters of such high order that both are entitled to give their name to their respective descendants".