Armand de Gontaut, baron de Biron (, 152426 July 1592) was a soldier, diplomat and Marshal of France. Beginning his service during the Italian Wars, Biron served in Italy under Marshal Brissac and Guise in 1557 before rising to command his own cavalry regiment. Returning to France with the Peace of Cateau-Cambresis he took up his duties in Guyenne, where he observed the deteriorating religious situation that was soon to devolve into the French Wars of Religion. He fought at the Battle of Dreux in the first civil war. In the peace that followed he attempted to enforce the terms on the rebellious governorship of Provence. Having fought for the crown during the decisive victory at Battle of Moncontour in 1569, he was elevated to the post of grandmaster of artillery. In this role he was tasked with reducing the town of Saint-Jean-d'Angély which proved resistant to his efforts. As the war dragged on he found himself increasingly involved in diplomatic efforts, meeting with Jeanne d'Albret repeatedly to talk terms. With peace declared in August 1570 he continued his negotiations with Albret in the hopes of setting up a marriage between her son Navarre and Margaret of Valois. In the wake of the Massacre of Saint Bartholomew he was tasked with reducing the well defended city of La Rochelle, commanding the artillery batteries he made limited progress over the following months, before Anjou oversaw peace negotiations so that he might depart for the Poland-Lithuanian Commonwealth. Upon Henri III's ascent as French king Biron was appointed as a Marshal. His forces were involved in containing Condé as he tried to re-enter France during the fifth civil war. He was involved again as a diplomat in conducting negotiations in the late 1570s, fighting again in the sixth civil war. When in 1573 Alençon who had become sovereign of the Dutch requested reinforcements to secure his position in the country. Biron led troops to support his administration. He would not be involved in the French Fury that saw Alençon's position collapse in the country. With the dominance of the Ligue in the following years Biron half heartedly pursued their objectives before supporting Henri when he broke with the Ligue in 1588. With the king's death in 1589, he transferred his loyalties to Navarre, aiding him in his campaigns in Normandy against the Ligue. It was during a siege of a Ligue town that