Question: What is the birthdate of this King of England, noted for his military success and for restoring royal authority after a disastrous reign, who claimed the French throne in 1340? 

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Uzana of Pagan: Uzana (Burmese: ဥဇနာ , ] ; also known as Sithu III; 1213–1256) was king of Pagan dynasty of Burma (Myanmar) from 1251 to 1256.  Although his actual reign lasted only five years, Uzana was essentially the power behind the throne during his predecessor Kyaswa's reign, 1235–1251.  Kyaswa, a devout Buddhist and scholar, had given Uzana full royal authority to govern the kingdom to the business of governing the country.  However Uzana reportedly cared more about chasing elephants, and drinking liquor than governing during his father's or his reign.  As king, he left the task of governing to his chief minister Yazathingyan.  The king was accidentally killed at Dala (modern Twante) in May 1256 while hunting elephants.

Treaty of Troyes: The Treaty of Troyes was an agreement that King Henry V of England and his heirs would inherit the throne of France upon the death of King Charles VI of France.  It was signed in the French city of Troyes on 21 May 1420 in the aftermath of Henry's successful military campaign in France.  It forms a part of the backdrop of the latter phase of the Hundred Years' War finally won by the French at the Battle of Castillon in 1453, and in which various English kings tried to establish their claims to the French throne.

Henry III of England: Henry III (1 October 1207 – 16 November 1272), also known as Henry of Winchester, was King of England, Lord of Ireland and Duke of Aquitaine from 1216 until his death.  The son of King John and Isabella of Angoulême, Henry assumed the throne when he was only nine in the middle of the First Barons' War.  Cardinal Guala declared the war against the rebel barons to be a religious crusade and Henry's forces, led by William Marshal, defeated the rebels at the battles of Lincoln and Sandwich in 1217.  Henry promised to abide by the Great Charter of 1225, which limited royal power and protected the rights of the major barons.  His early rule was dominated first by Hubert de Burgh and then Peter des Roches, who re-established royal authority after the war.  In 1230 the King attempted to reconquer the provinces of France that had once belonged to his father, but the invasion was a debacle.  A revolt led by William Marshal's son, Richard, broke out in 1232, ending in a peace settlement negotiated by the Church.

English claims to the French throne: From the 1340s to the 19th century, excluding two brief intervals in the 1360s and the 1420s, the kings and queens of England (and, later, of Great Britain) also claimed the throne of France.  The claim dates from Edward III, who claimed the French throne in 1340 as the sororal nephew of the last direct Capetian, Charles IV.  Edward and his heirs fought the Hundred Years War to enforce this claim, and were briefly successful in the 1420s under Henry V and Henry VI, but the House of Valois, a cadet branch of the Capetian dynasty, was ultimately victorious and retained control of France.  Despite this, English and British monarchs continued to prominently call themselves kings of France, and the French fleur-de-lys were included in the royal arms.  This continued until 1801, by which time France had no monarch, having become a republic.  The Jacobite claimants, however, did not explicitly relinquish the claim.

Louis of France (1264–1276): Louis of France (1263 or 1264 – Château de Vincennes, before May 1276), was an heir apparent to the French throne.  He was the eldest son of King Philip III of France and his first wife, Isabella of Aragon (1247-1271).  He was the heir apparent to the French throne from August 25, 1270 (at the death of his grandfather Louis IX of France), until his own premature death, at the age of 12-13.

Edward III of England: Edward III (13 November 1312 – 21 June 1377) was King of England from 25 January 1327 until his death; he is noted for his military success and for restoring royal authority after the disastrous and unorthodox reign of his father, Edward II.  Edward III transformed the Kingdom of England into one of the most formidable military powers in Europe.  His long reign of 50 years was the second longest in medieval England and saw vital developments in legislation and government—in particular the evolution of the English parliament—as well as the ravages of the Black Death.

Levan of Imereti: Levan (Georgian: ლევანი ) (1573–1590), of the Bagrationi Dynasty, was a king of Imereti from 1585 to 1588.  He succeeded on the death of his father, George II, in 1585 when he was twelve years old.  With his ascend to the throne, Leon faced a revolt by his own uncle, Constantine, who defied the royal authority and took control of Upper Imereti.  Leon made an alliance with the Mingrelian prince Mamia IV Dadiani, married his sister Marekhi, and forced Constantine to surrender in 1587.  A year later, Imereti was invaded by Simon I, the resurgent king of Kartli in eastern Georgia, who sought to reunify all Georgian lands under his crown.  Leon was forced to flee to the highland province of Lechkhumi, but was soon able to resume the throne after Simon had to return to Kartli.  However, Leon soon quarreled with his brother-in-law Mamia IV Dadiani who defeated the king and imprisoned him at Fort Shkheti, Mingrelia, where he died in 1590.

Prince Michel, Count of Évreux: Prince Michel of Orléans, Fils de France, Count of Évreux (Michel Joseph Benoît Marie; born 25 June 1941, Rabat, Morocco) is a French nobleman and part of the claimant family to the French throne.  He is the son of the late Prince Henri, Count of Paris (the Orleanist claimant to the French throne from 1940 until his death) and Princess Isabelle of Orléans-Braganza.  Prince Michel is styled as the Count of Évreux.

Henry VI of England: Henry VI (6 December 1421 – 21 May 1471) was King of England from 1422 to 1461 and again from 1470 to 1471, and disputed King of France from 1422.  The only child of Henry V, he succeeded to the English throne at the age of nine months upon his father's death, and succeeded to the French throne on the death of his grandfather Charles VI shortly afterwards.  Henry inherited the long-running Hundred Years War (1337–1453), where Charles VII contested his claim to the French throne.  Henry married Charles's niece, Margaret of Anjou, partially in the hope of achieving peace in 1445, but the policy failed, leading to the murder of William de la Pole, one of Henry's key advisors.  The war recommenced, with France taking the upper hand; by 1453, Calais was Henry's only remaining territory on the continent.

Constitutions of Clarendon: The Constitutions of Clarendon were a set of legislative procedures passed by Henry II of England in 1164.  The Constitutions were composed of 16 articles and represent an attempt to restrict ecclesiastical privileges and curb the power of the Church courts and the extent of Papal authority in England.  In the anarchic conditions of Henry II's predecessor, Stephen, the church had extended its jurisdiction by taking advantage of the weakness of royal authority.  The Constitutions were claimed to restore the judicial customs observed during the reign of Henry I (1100–35), while in fact they were a part of Henry II's larger expansion of royal jurisdiction into the Church and civil law, which was a defining aspect of his reign.

Supporting paragraphs: English claims to the French throne Edward III of England
Answer: 13 November 1312