Henry of Navarre

The men of Love's Labor's Lost are Navarre (also called Ferdinand), Berowne, Dumaine, and Longaville. And while the events of the play may be fictitious, these characters are not. Navarre is Henry of Navarre who would become Henry IV of France about the time that the play was written. He had three noblemen in his company; the baron de Biron, the duc de Longueville, and the duc de Mayenne. (pg. 227-228)

Shakespeare, William. "Love's Labor's Lost." FOLGER Shakespeare Library. Ed. Barbara A. Mowat and Paul Werstine. New York, NY: Washington Square Press, 1996. Print.

For further reading of the exploits of Henry IV:
ORO Henry IV