Question: The County of Savoy and the Plantaganet monarchy of England had been linked by the marriage of which person, also known as Henry of Winchester, was King of England, Lord of Ireland and Duke of Aquitaine from 1216 until his death, and Eleanor of Provence in 1236? 

Context paragraphs:
Richard I of England: Richard I (8 September 1157 – 6 April 1199) was King of England from 6 July 1189 until his death.  He also ruled as Duke of Normandy, Aquitaine and Gascony, Lord of Cyprus, Count of Poitiers, Anjou, Maine, and Nantes, and was overlord of Brittany at various times during the same period.  He was the third of five sons of King Henry II of England and Duchess Eleanor of Aquitaine.  He was known as Richard Cœur de Lion or Richard the Lionheart because of his reputation as a great military leader and warrior.  He was also known in Occitan as Oc e No ("Yes and No"), because of his reputation for terseness.

Eleanor of England, Queen of Castile: Eleanor of England (Spanish: "Leonor" ; 13 October 1161 – 31 October 1214), or Eleanor Plantaganet, was Queen of Castile and Toledo as wife of Alfonso VIII of Castile.  She was the sixth child and second daughter of Henry II, King of England, and Eleanor of Aquitaine.

Angevin kings of England: The Angevins ("from Anjou") were an English royal house in the 12th and early 13th centuries; its monarchs were Henry II, Richard I and John.  In the 10 years from 1144, two successive counts of Anjou, Geoffrey and his son, the future Henry II, won control of a vast assemblage of lands in western Europe that would last for 80 years and would retrospectively be referred to as the Angevin Empire.  As a political entity this was structurally different from the preceding Norman and subsequent Plantagenet realms.  Geoffrey became Duke of Normandy in 1144 and died in 1151.  In 1152 his heir, Henry, added Aquitaine by virtue of his marriage to Eleanor of Aquitaine.  Henry also inherited the claim of his mother, Empress Matilda, the daughter of King Henry I, to the English throne, to which he succeeded in 1154 following the death of King Stephen.

Savoyard knights in the service of Edward I: The County of Savoy and the Plantaganet monarchy of England had been linked by the marriage of Henry III of England and Eleanor of Provence in 1236.  Eleanor of Provence was the daughter of Beatrice of Savoy.

Eleanor, Fair Maid of Brittany: Eleanor Fair Maid of Brittany (c. 1184 – 10 August 1241), also known as Damsel of Brittany, Pearl of Brittany, or Beauty of Brittany, was the eldest daughter of Geoffrey II, Duke of Brittany, the fourth son of King Henry II of England, and Constance, Duchess of Brittany.  After the presumed death in 1203 of her imprisoned younger brother, Arthur, she was heiress to vast lands including England, Anjou, and Aquitaine as well as Brittany, realms where the Salic Law barring the accession of females did not apply.  Her uncle John, King of England was the fifth son of Henry II, and Eleanor inherited Arthur's claim to the throne as child of John's elder brother Geoffrey.  Thus she posed a potential threat to John, and following his death in 1216, equally to her cousin, Henry III of England.  She was imprisoned from 1202, and thus became the longest-imprisoned member of an English royal family.  As a prisoner she was also unable to press her claim to the Duchy of Brittany as her mother's heiress.

Henry II of England: Henry II (5 March 1133 – 6 July 1189), also known as Henry Curtmantle (French: "Court-manteau" ), Henry FitzEmpress or Henry Plantagenet, ruled as Count of Anjou, Count of Maine, Duke of Normandy, Duke of Aquitaine, Count of Nantes, King of England and Lord of Ireland; at various times, he also controlled Wales, Scotland and Brittany.  Henry was the son of Geoffrey of Anjou and Matilda, daughter of Henry I of England.  He became actively involved by the age of 14 in his mother's efforts to claim the throne of England, then occupied by Stephen of Blois, and was made Duke of Normandy at 17.  He inherited Anjou in 1151 and shortly afterwards married Eleanor of Aquitaine, whose marriage to Louis VII of France had recently been annulled.  Stephen agreed to a peace treaty after Henry's military expedition to England in 1153, and Henry inherited the kingdom on Stephen's death a year later.

Walter de Beauchamp (judge): Walter de Beauchamp (1195/97–1236) was an English judge, son and heir of William de Beauchamp and Amice de Beauchamp, lord of Elmley, Worcester, and hereditary castellan of Worcester and sheriff of the county.  A minor at his father's death, he did not obtain his shrievalty till February 1216.  Declaring for Louis of France on his arrival (May 1216), he was excommunicated by the legate at Whitsuntide, and his lands seized by the Marchers.  But hastening to make his peace, on the accession of Henry, he was one of the witnesses to his reissue of the charter, and was restored to his shrievalty and castellanship.  He also Attested Henry's 'Third Charter,' on 11 February 1225.  In May 1226 and in January 1227 he was appointed an itinerant justice, and 14 April 1236 he died, leaving by his wife Joane Mortimer, daughter of his guardian, Roger de Mortimer, whom he had married in 1212, and who died in 1225, a son and heir, William, who married the eventual heiress of the earls of Warwick, and was grandfather of Guy de Beauchamp, 10th Earl of Warwick.

Eleanor of Provence: Eleanor of Provence (c. 1223 – 24/25 June 1291) was Queen consort of England, as the spouse of King Henry III of England, from 1236 until his death in 1272.  She served as regent of England during the absence of her spouse in 1253.

Peter of Aigueblanche: Peter of Aigueblanche (or Peter of Aquablanca; died 27 November 1268) was a medieval Bishop of Hereford.  A nobleman from Savoy, he came to England as part of the party accompanying King Henry III's bride Eleanor of Provence.  He entered the royal service, becoming bishop in 1241.  He then served the king for a number of years as a diplomat, helping to arrange the marriage of Prince Edward.  Peter became embroiled in King Henry's attempts to acquire the kingdom of Sicily, and Peter's efforts to raise money towards that goal brought condemnation from the clergy and barons of England.  When the barons began to revolt against King Henry in the late 1250s and early 1260s, Peter was attacked and his lands and property pillaged.  He was arrested briefly in 1263 by the barons, before being mostly restored to his lands after the Battle of Evesham.

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.

Supporting paragraphs: Savoyard knights in the service of Edward I Henry III of England
Answer: Henry III of England