Sébastien de Luxembourg

Martigues was the son of François de Luxembourg and Charlotte de Brosse, daughter of René de Brosse. Martigues was the nephew of Étampes and served under him when he was made governor of Brittany as lieutenant-general for the governorship. He was further allowed to inherit the estates of his uncle that had been confiscated during the League of the Public Weal, making him first comte then duc de Penthièvre.[1]

In 1556 he married Marie de Beaucaire (1535-1613), a daughter of Jean de Beaucaire sieur de Puyguillon, or Péguillon, and Guyonne de Breüil. She was a lady in waiting to Mary, Queen of Scots.[2] He asked the queen of Scots to be godmother to his daughter Marie in 1562 and she sent David Beaton of Melgund as her representative.[3] His daughter and heiress Marie de Luxembourg married Philippe-Emmanuel de Lorraine, duc de Mercœur, a prominent member of the Ligue in Brittany.[4]

During the siege of Rouen in 1562, the colonel-general of the infantry Randan was killed. Martigues was selected as his replacement and would become the new colonel-general of the infantry.[6] In December the royal army successfully brought the main force under Condé to battle at Dreux. Martigues played an important role on the right of the royal army, commanding a block of veteran French infantry.[7] He and his troops were held in reserve for much of the battle, until it was deployed late in the day, when the Huguenot cavalry looked like it might overwhelm the crowns forces. Martigues' troops formed up a square and held the cavalry off, after which Coligny ordered the Protestant forces to retreat from the field.[8]

Upon the death of his uncle on 31 January 1565, Martigues became governor of Brittany. He would hold this office until his death.[9]

With the rebel army bested at the Battle of Saint Denis, Condé withdrew his forces eastwards. Before the royal army could pursue him, reorganisation was necessary. Breton cavalry under Martigues was hurriedly raised and sent to Paris to help form the nucleus of the pursuit army.[10] His 3000 troops passed through Chartres in their march to the east, stripping the town bare of all its supplies.[11]

An ally of the militant Catholic Charles, Cardinal of Lorraine, Martigues was among those councillors who desired to overturn the peace settlement agreed with the Peace of Longjumeau in 1568.[12] As the peace broke down, Montgommery and the Vidame de Chartres moved south from Brittany pursued by Martigues.[13]

With the resumption of civil war in late 1568, the Protestant nobility fled south to regroup at La Rochelle, to provide support to them an army assembled in Provence and began marching north. In early November Martigues and Louis, Duke of Montpensier met the rebel force in battle and destroyed it.[14] Following the crushing royal victory at the Battle of Moncontour the royal army, after some debate, decided to press their advantage rather than seeking terms. To this end they began siege of Saint-Jean-d'Angély on 16 October 1569. Martigues who had fought with the royal army at Moncontour fought in the siege, and was shot dead by one of the defenders while he was in the siege trenches on 19 November 1569.[15][9]