The works dealing with Henry IV. and his reign are too numerous to be enumerated here. For sources, see the _Recueil des lettres missives de Henri IV_, published from 1839 to 1853 by B. de Xivrey, in the _Collection de documents inédits relatifs à l'histoire de France_, and the various researches of Galitzin, Bautiot, Halphen, Dussieux and others. Besides their historic interest, the letters written personally by Henry, whether love notes or letters of state, reveal a charming writer. Mention should be made of Auguste Poirson's _Histoire du règne de Henri IV_ (2nd ed., 4 vols., Paris, 1862-1867) and of J. H. Mariéjol's volume (vi.) in the _Histoire de France_, edited by Ernest Lavisse (Paris, 1905), where main sources and literature are given with each chapter. A _Revue Henri IV_ has been founded at Paris (1905). Finally, a complete survey of the sources for the period 1494-1610 is given by Henri Hauser in vol. vii. of _Sources de l'histoire de France_ (Paris, 1906) in continuation of A. Molinier's collection of the sources for French history during the middle ages.
HENRY I. (c. 1210-1274), surnamed _le Gros_, king of Navarre and count of Champagne, was the youngest son of Theobald I. king of Navarre by Margaret of Foix, and succeeded his eldest brother Theobald III. as king of Navarre and count of Champagne in December 1270. His proclamation at Pamplona, however, did not take place till March of the following year, and his coronation was delayed until May 1273. After a brief reign, characterized, it is said, by dignity and talent, he died in July 1274, suffocated, according to the generally received accounts, by his own fat. In him the male line of the counts of Champagne and kings of Navarre, became extinct. He married in 1269 Blanche, daughter of Robert, count of Artois, and niece of King Louis IX. and was succeeded by his only legitimate child, Jeanne or Joanna, by whose marriage to Philip IV. afterwards king of France in 1284, the crown of Navarre became united to that of France.
HENRY II. (1503-1555), titular king of Navarre, was the eldest son of Jean d'Albret (d. 1516) by his wife Catherine de Foix, sister and heiress of Francis Phoebus, king of Navarre, and was born at Sanquesa in April 1503. When Catherine died in exile in 1517 Henry succeeded her in her claim on Navarre, which was disputed by Ferdinand I. king of Spain; and under the protection of Francis I. of France he assumed the title of king. After ineffectual conferences at Noyon in 1516 and at Montpellier in 1518, an active effort was made in 1521 to establish him in the _de facto_ sovereignty; but the French troops which had seized the country were ultimately expelled by the Spaniards. In 1525 Henry was taken prisoner at the battle of Pavia, but he contrived to escape, and in 1526 married Margaret, the sister of Francis I. and widow of Charles, duke of Alençon. By her he was the father of Jeanne d'Albret (d. 1572), and was consequently the grandfather of Henry IV. of France. Henry, who had some sympathy with the Huguenots, died at Pau on the 25th of May 1555.