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Alexandre de Vendôme
Chevalier de Vendôme
Prior of the Order
Knight of the Order
Governor of Caen
Personal details
Born	19 April 1598
Died	28 February 1629(1629-02-28) (aged 30)
Parents	Henry IV of France (father) Gabrielle d'Estrées (mother)

Alexandre de Vendôme (19 April 1598 – 28 February 1629) was the third illegitimate child, and second illegitimate son, of Henry IV of France and his mistress Gabrielle d'Estrées. He was a prior of the Langue of France of the Order of Saint John of Jerusalem.

Baptized in Saint-Germain-en-Laye on 13 December 1598,^[1] he was governor of Caen^[2] from birth throughout his life and entered the Order of Saint John of Jerusalem in 1604. King Louis XIII, his half-brother, appointed him to lead an embassy to Pope Paul V at Rome in October 1614.

In 1626 alongside his brother César, Duke of Vendôme and half-brother Gaston, Duke of Orléans, he participated in the Chalais conspiracy, directed against Cardinal Richelieu, who was the Prime Minister of his half-brother, King Louis XIII. Arrested, he was incarcerated in Amboise, then in Vincennes where he died.

• Laurent Sonnius, ed. (1615). RECIT (le) de l'arrivée solemnelle entrée du très-illustre & excellent seigneur Messire Alexandre de Vendosme frère naturel de sa Majesté très-chrestienne, Grand Prieur de Tholose, de la Religion & de l'Ordre de Jérusalem. Faicte à Rome le 2 octobre 1615 avec la cavalcade de la Sainte Église au Consistoire public & autres particularités. Traduit d'Italien en Français (in French). Paris. Note: Contains a description of the spectacular procession as his embassy entered Rome.
• Henri de Curzon (1886). "Une réception au Temple. Alexandre de Vendôme, 1er février 1604". Bibliothèque de l'École des chartes (in French) (47): 106–117. doi:10.3406/bec.1886.447440.