Jacques Margeret (ca. 1565–1619) was a French mercenary captain who, in 1607, wrote the first printed French travel account of Muscovy, entitled, "Estate de l’Empire de Russie et de Grand Duché de Moscovie".
A member of one of the oldest families of Auxonne, located on the border between Burgundy and Franche-Comté, Margeret was probably born ca 1565. He grew up in the turbulent period known as the French Wars of Religion, in a Protestant family. Becoming a soldier, he fought for the Protestant King Henri IV of France against the Catholic League, serving the king until Henri’s conversion to Catholicism in 1593.
After leaving Henri’s service Margeret joined the crusade against the Turks in south east Europe. He first served with the Prince of Transylvania and then with the Holy Roman Emperor in Hungary. Next, he commanded a company of foot soldiers in Poland. He returned then to Austria where a Muscovite ambassador invited him to Moscow in 1600.
Margeret received command of a company of foreign mercenaries (cavalry) from Boris Godunov. For his service he received an annual pay 80 rubles and nearly 1,000 acres (4 km2) of land. After several years service, Margeret rose to the rank of overall commander of the Tsar’s foreign troops. He was a part of the army that was sent to repel the Pretender Dmitrii Ivanovich’s invasion of Muscovy in 1604–05. In fact, his actions at the battle of Dobrynichi were decisive in the defeat of Dmitrii’s forces. When, after Boris’ death in 1605, the Tsar’s army submitted to the rule of the Pretender Dmitrii, Margeret and his foreign mercenaries had little choice but to also serve Dmitrii. In Jan 1606, Margeret was appointed commander of Palace Guards. In May of that year Dmitirii was assassinated. Although his successor Vasilii Shuskii dismissed most of the foreign mercenaries, Margeret was asked to remain. He did so until the summer of 1606 at which time he asked permission to leave, departing from Archangel for France in September 1606.