Question: During the reign of Louis XIII of France, another of his kingdoms was merged with the French crown, making him the last King of where?

Context paragraphs:
French Crown Jewels: The French Crown Jewels (French: "Joyaux de la Couronne de France" ) comprise the crowns, orb, sceptres, diadems and jewels that were symbols of Royal power between 752 and 1825.  These were worn by many Kings and Queens of France.  The set was finally broken up, with most of it sold off in 1885 by the Third French Republic.  The surviving French Crown Jewels, principally a set of historic crowns, diadems and parures, are mainly on display in the "Galerie d'Apollon" of the Louvre, France's premier museum and former royal palace, together with the Regent Diamond, the Sancy Diamond and the 105 carat "Côte-de-Bretagne" red spinel, carved into the form of a dragon.  In addition, some gemstones and jewels (including the Emerald of Saint Louis, the 'Ruspoli' sapphire and the diamond pins of Queen Marie Antoinette) are on display in the Treasury vault of the Mineralogy gallery in the Muséum national d'histoire naturelle.

Siege of La Rochelle: The Siege of La Rochelle (French: "Le Siège de La Rochelle", or sometimes "Le Grand Siège de La Rochelle") was a result of a war between the French royal forces of Louis XIII of France and the Huguenots of La Rochelle in 1627–28.  The siege marked the apex of the tensions between the Catholics and the Protestants in France, and ended with a complete victory for King Louis XIII and the Catholics.

Ballet de la Merlaison: The Ballet de la Merlaison is a ballet de cour first performed in 1635 at the Château de Chantilly, during the reign of Louis XIII.  It is the most popular ballet performed during the reign of Louis XIII, which marked an important development of the Ballet de cour.

Louis XIII style: The Louis XIII style or Louis Treize was a fashion in French art and architecture, especially effecting the visual and decorative arts.  Its distinctness as a period in the history of French art has much to do with the regency under which Louis XIII began his reign (1610–1643).  His mother and regent, Marie de' Medici, imported mannerism from her homeland of Italy and the influence of Italian art was to be strongly felt for several decades.

Château Cany: Château Cany is located in Cany-Barnville, a French municipality in the department of Seine-Maritime.  It was built by Pierre Le Marinier towards the end of Louis XIII’s reign and served as a family residence.  Only minor changes were made in the following years and it was not even damaged during the French Revolution.  Around 1830, the House of Montmorency had the building renovated and partially changed.  Later on, the estate passed into the hands of the House of Hunolstein and finally, in the first quarter of the 20th century, it passed into the possession of the Dreux-Brézé family, whose descendants are still the owners of the château today.

Counts and Dukes of Angoulême: Angoulême ("L'Angoumois") in western France was part of the Carolingian Empire as the kingdom of Aquitaine.  Under Charlemagne's successors, the local Count of Angoulême was independent and was not united with the French crown until 1308.  By the terms of the Treaty of Brétigny (1360) the Angoumois, then ruled by the Counts of Angoulême, was ceded as English territory to Edward III.  In 1371 it became a fief of the Duke of Berry, before passing to Louis I, Duke of Orleans, both of whom were cadets of the French royal family.  From then on it was held by cadets of the Valois House of Orleans, until Francis, Count of Angoulême, became King of France in 1515.  Angoumois was definitively incorporated into the French crown lands, as a duchy.

Siege of Nègrepelisse: The Siege of Nègrepelisse (French: "Siège de Nègrepelisse") was a siege accomplished by the young French king Louis XIII in 1622, against the Protestant stronghold of Nègrepelisse in France.  This siege followed the Siege of Montauban, in which Louis XIII had failed against the Huguenot city.

Dual monarchy of England and France: The dual monarchy of England and France existed during the latter phase of the Hundred Years' War when Charles VII of France and Henry VI of England disputed the succession to the throne of France.  It commenced on 21 October 1422 upon the death of King Charles VI of France, who had signed the Treaty of Troyes which gave the French crown to his son-in-law Henry V of England and Henry's heirs.  It excluded King Charles's son, the Dauphin Charles, who by right of primogeniture was the heir to the Kingdom of France.  Although the Treaty was ratified by the Estates-General of France, the act was a contravention of the French law of succession which decreed that the French crown could not be alienated.  Henry VI, son of Henry V, became king of both England and France and was recognized only by the English and Burgundians until 1435 as King Henry II of France.  He was crowned King of France on 16 December 1431.

Louis XIII of France: Louis XIII (] ; 27 September 1601 – 14 May 1643) was a monarch of the House of Bourbon who ruled as King of France from 1610 to 1643 and King of Navarre (as Louis II) from 1610 to 1620, when the crown of Navarre was merged with the French crown.

Nicolas de Neufville, seigneur de Villeroy: Nicolas IV de Neufville, seigneur de Villeroy (1543 – 12 November 1617) was a secretary of state under four kings of France: Charles IX, Henry III, Henry IV, and Louis XIII.  The most distinguished of all sixteenth-century French secretaries, Villeroy rose to prominence during the French Wars of Religion, a period of almost insoluble difficulties for the French monarchy and government.  Despite faithfully serving Henry III, Villeroy found himself sacked by him without explanation in 1588, along with all the king's ministers.  He was reinstated by Henry IV in 1594 and became more important than ever before.  He remained in office until his death in 1617 during the reign of Louis XIII.

Supporting paragraphs: Château Cany Louis XIII of France
Answer: Navarre