Question: Henry of Almain was the song of one of the wealthiest men in Europe who joined what?

full_context: Document 1: Richard II of England: Richard II (6 January 1367 – c. 14 February 1400), also known as Richard of Bordeaux, was King of England from 1377 until he was deposed on 30 September 1399. Richard, a son of Edward, the Black Prince, was born in Bordeaux during the reign of his grandfather, Edward III. His father was Prince of Aquitaine. Richard was the younger brother of Edward of Angoulême, upon whose death Richard, at three years of age, became second in line to the throne after his father. Upon the death of Richard's father prior to the death of Edward III, Richard, by primogeniture, became the heir apparent to the throne. With Edward III's death the following year, Richard succeeded to the throne at the age of ten.
Document 2: John of Ibelin, the Old Lord of Beirut: John of Ibelin (c. 1179 – 1236), called the Old Lord of Beirut, was a powerful crusader noble in the 13th century, one of the best known representatives of the influential Ibelin family. The son of Balian of Ibelin and Maria Comnena, Queen consort of Jerusalem, he had close ties with the nobility of both Cyprus and Jerusalem, since he was the half-brother of Queen Isabella I of Jerusalem. Before he was 20, he was appointed constable of Jerusalem, and a few years later became lord of Beirut, where he rebuilt the city after Saladin's conquest, and established the grand Ibelin family palace. He served as regent for two of his young relatives, Isabella's daughter Maria of Montferrat from 1205 to 1210, and then Henry I of Cyprus from 1228 until Henry came of age in 1232. John was known as a principled man, and was seen as the natural leader of the Christian barons in the Holy Land. He resisted the power-seeking of Frederick II, Holy Roman Emperor, in Cyprus, and opposed the imperial forces until Henry came of age.
Document 3: Henry the Lion: Henry the Lion (German: "Heinrich der Löwe" ; 1129/1131 – 6 August 1195 ) was a member of the Welf dynasty and Duke of Saxony, as Henry III, from 1142, and Duke of Bavaria, as Henry XII, from 1156, the duchies of which he held until 1180.
Document 4: Richard, 1st Earl of Cornwall: Richard (5 January 1209 – 2 April 1272), second son of John, King of England, was the nominal Count of Poitou (1225-1243), Earl of Cornwall (from 1225) and King of Germany (from 1257). He was one of the wealthiest men in Europe and joined the Barons' Crusade, where he achieved success as a negotiator for the release of prisoners and assisted with the building of the citadel in Ascalon.
Document 5: Henry, son of Robert I of Burgundy: Henry of Burgundy (c. 1035 – January 27, 1070/1074), called the Gallant ("le Damoiseau"), was the eldest surviving son and heir of Robert I, Duke of Burgundy and his wife, Helie of Semur, and a grandson of King Robert II of France, thus making him a member of the House of Capet through its Burgundy cadet branch. Little is known about his life and he died shortly before his father, and thus was never duke himself. Two of his sons became dukes in succession after his father's death, while a third son became Count of Portugal through his marriage to Theresa, daughter of King Alfonso VI of León and Castile.
Document 6: Henry I of Castile: Henry I of Castile (14 April 1204 – 6 June 1217) was king of Castile. He was the son of Alfonso VIII of Castile and Eleanor of England, Queen of Castile (daughter of Henry II of England and Eleanor of Aquitaine).
Document 7: 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.
Document 8: Richard Neville, 16th Earl of Warwick: Richard Neville, 16th Earl of Warwick (22 November 1428 – 14 April 1471), known as Warwick the Kingmaker, was an English nobleman, administrator, and military commander. The son of Richard Neville, 5th Earl of Salisbury, Warwick was the wealthiest and most powerful English peer of his age, with political connections that went beyond the country's borders. One of the leaders in the Wars of the Roses, originally on the Yorkist side but later switching to the Lancastrian side, he was instrumental in the deposition of two kings, a fact which later earned him his epithet of "Kingmaker" to later generations.
Document 9: Richard de Clare, 6th Earl of Gloucester: Richard de Clare, 5th Earl of Hertford, 6th Earl of Gloucester, 2nd Lord of Glamorgan, 8th Lord of Clare (4 August 1222 – 14 July 1262) was son of Gilbert de Clare, 4th Earl of Hertford and Isabel Marshal. On his father's death, when he became Earl of Gloucester (October 1230), he was entrusted first to the guardianship of Hubert de Burgh. On Hubert's fall, his guardianship was given to Peter des Roches (c. October 1232); and in 1235 to Gilbert, Earl Marshall. He was also a powerful Marcher Lord in Wales and inherited the Lordship of Glamorgan upon the death of his father.
Document 10: Henry of Almain: Henry of Almain (Anglo-Norman French: "Henri d'Almayne") (2 November 1235 – 13 March 1271) was the son of Richard, 1st Earl of Cornwall and his first wife Isabel Marshal. His surname is derived from a vowel shift in pronunciation of "d'Allemagne" (English: of Germany), so called by the elites of England because of his father's status as the elected German King of the Romans (the "King of Almayne").
Document 11: Richard Weston (treasurer): Sir Richard Weston (1465–1541), KB, of Sutton Place in Surrey, was a courtier and diplomat who served as Governor of Guernsey, Treasurer of Calais and Under-Treasurer of the Exchequer during the reign of King Henry VIII.
Document 12: John of Bohemia: John the Blind (Luxembourgish: "Jang de Blannen" ; German: "Johann der Blinde von Luxemburg" ; ; 10 August 1296 – 26 August 1346) was the Count of Luxembourg from 1309 and King of Bohemia from 1310 and titular King of Poland. He was the eldest son of the Holy Roman Emperor Henry VII and his wife Margaret of Brabant. He is well known for having died while fighting in the Battle of Crécy at age 50, after having been blind for a decade.
Document 13: Richard de Redvers, 2nd Earl of Devon: Richard de Redvers, 2nd Earl of Devon (died 1162) was Earl of Devon from 1155 until his death and was feudal baron of Plympton in Devon. He married Denise, one of the daughters and coheiresses of Reginald, Earl of Cornwall. He was High Sheriff of Devon from 1154–1157. He was the son of Baldwin de Redvers, 1st Earl of Devon and nephew of William de Reviers, 5th Earl of Devon.
Document 14: Henry II, Holy Roman Emperor: Henry II (German: "Heinrich II" ; Italian: "Enrico II" ) (6 May 973 – 13 July 1024), also known as Saint Henry, Obl. S. B., was Holy Roman Emperor ("Romanorum Imperator") from 1014 until his death in 1024 and the last member of the Ottonian dynasty of Emperors as he had no children. The Duke of Bavaria from 995, Henry became King of Germany ("Rex Romanorum") following the sudden death of his second cousin, Emperor Otto III in 1002, was crowned King of Italy ("Rex Italiae") in 1004, and was crowned by the Pope as Emperor in 1014.
Document 15: Conrad IV of Germany: Conrad (25 April 1228 – 21 May 1254), a member of the Hohenstaufen dynasty, was the only son of Emperor Frederick II from his second marriage with Queen Isabella II of Jerusalem. He inherited the title of a King of Jerusalem (as Conrad II) upon the death of his mother in childbed. Appointed Duke of Swabia in 1235, his father had him elected King of Germany (King of the Romans) and crowned King of Italy (as Conrad IV) in 1237. After the emperor was deposed and died in 1250, he ruled as King of Sicily (Conrad I) until his death.
ground_truth: the Barons' Crusade