The Monarchomachs included jurists such as the Calvinists François Hotman (1524–1590), Théodore de Bèze (1519–1605), Simon Goulart (1543–1628), Nicolas Barnaud (1538–1604), Hubert Languet (1518–1581), Philippe de Mornay (1549–1623) and George Buchanan (1506–1582), as well as Catholic writers such as Juan de Mariana (1536–1624). Through the means of libels and theoretical tracts, they revived the doctrine of the tyrannicide. It had been opposed during the Middle Ages by the "legists" (jurists who theorized the royal power) who attempted to reserve the title of tyrant to those who tried to overturn the ruling monarch. Legists thus ended up legitimizing, under the name of "tyrannicide", the assassinations of political opponents ordered by the monarch.