François de Beaumont, baron of Adrets (c. 1512/1513 – February 2, 1587) was a leader (capitaine dauphinois) of the Huguenots in the religious wars of The French Reformation. Known for his cruelty in action, he was a supporter of the Protestant troops, then changed sides in 1567 to join the Catholics.
He was born in 1512 or 1513 at the château of La Frette (Isère). [In other version, he was born around 1506 in the fortified house of his father in Villard-Castle, in the town of Adrets.] He was the son of Georges de Beaumont, baron of the Adrets and Jeanne Guiffrey. He married Claude Gumin with whom he had several children. None of his son survived him. One of them was killed at the siege of La Rochelle in 1573. His two girls had only one offspring.
During the reign of Henry II of France he served with distinction in the royal army and became colonel of the legions of Dauphiné, Provence and Languedoc. From 1525 to 1559, he waged war in Italy, where he distinguished himself by his bravery under the orders of Marshal Brissac. He was taken prisoner in 1558 by the Spaniards in Moncalvo and must pay ransom to free himself. In 1562, however, he joined the Huguenots, not from religious conviction but probably from motives of ambition and personal dislike of the house of Guise.
His campaign against the Catholics in 1562 was eminently successful. In June of that year Des Adrets was master of the greater part of Dauphiné. But his brilliant military qualities were marred by his revolting atrocities. The reprisals he exacted from the Catholics after their massacres of the Huguenots at Orange have left a dark stain upon his name. The garrisons that resisted him were butchered with every circumstance of brutality, and at Montbrison, in Forez, he forced eighteen prisoners to throw themselves from the top of the keep. Having alienated the affections of the Huguenots by his pride and violence, he entered into communication with the Catholics, and declared himself openly in favor of conciliation. Following the defeat of the Protestant armies in Cahors, Amiens, Sens and the massacre of Wassy face Guise in March 1562, he took command in April of Protestants of Provence, and enters Valencia with 8000 men. From that moment and blazing overlapped, he routed the enemy in Romans-sur-Isère, Grenoble and Vienna where he plundered the Cathedral Saint-André and Notre-Dame de Grenoble. On 5 May 1562, he returned victorious in the city of Lyon. After Feurs in Forez, July 3, he marched on Montbrison at the head of four thousand, and seized the town 14 July 1562.