How was Henry IV related to the Bourbon dynasty?

Henry IV was a member of the house of Bourbon and served as the first French monarch from that dynasty. His relationship to the house is defined by his direct patrilineal descent from Louis IX, a king of the Capetian dynasty.123

Specifically, Henry IV was the son of Antoine de Bourbon, who was the head of the house of Bourbon and the duc de Vendôme. Through this lineage, Henry IV belonged to the La Marche–Vendôme branch of the family. Following the extinction of the legitimate male line of the house of Valois in 1589, Henry IV—as the senior member of the Bourbon line—became the rightful king of France under the Salic Law of Succession, which dictated that the crown pass through the male line. All subsequent Bourbon sovereigns were descendants of Henry IV.24