Question: John of Arsuf was the regent of Jerusalem under which memberof the Hohenstaufen dynasty?

full_context: Document 1: Conrad II of Italy: Conrad II (12 February 1074 – 27 July 1101) was the Duke of Lower Lorraine (1076–87), King of Germany (1087–98) and King of Italy (1093–98). He was the second son of Holy Roman Emperor Henry IV and Bertha of Savoy, and their eldest son to reach adulthood, his older brother Henry having been born and died in the same month of August 1071. Conrad's rule in Lorraine and Germany was nominal. He spent most of his life in Italy and there he was king in fact as well as in name.
Document 2: John II, Count of Ziegenhain: John II, Count of Ziegenhain (died 14 February 1450) was the second son of Count Gottfried VIII of Ziegenhain and his wife Agnes of Brunswick. He was the last reigning Count of Ziegenhain and Nidda. He probably owed His nickname "the Strong" to his obesity, although he is said to have possessed an extraordinary muscle strength as a young man. His younger brother Otto was Archbishop of Trier from 1419 until his death in 1430.
Document 3: Balian of Arsuf: Balian of Ibelin (1239 – 29 September 1277) was the Lord of Arsuf from 1258 until the early 1260s (probably 1261), when he leased/rented it to the Knights Hospitaller. He was the son and successor of John of Arsuf, Constable of Jerusalem. At the time when he leased/rented it to the Hospital, his fief of Arsuf was worth six knights' fees and twenty sergeants'; the Hospital took up his obligations with the exception of the "servise de cors".
Document 4: Constance, Queen of Sicily: Constance (2 November 1154 – 27 November 1198) was Queen regnant of Sicily in 1194–98, jointly with her spouse from 1194 to 1197, and with her infant son Frederick II, Holy Roman Emperor, in 1198, as the heiress of the Norman kings of Sicily. She was also Holy Roman Empress by marriage to Henry VI, Holy Roman Emperor.
Document 5: Conrad II, Holy Roman Emperor: Conrad II (c. 990 4 June 1039), also known as Conrad the Elder and Conrad the Salic , was Emperor of the Holy Roman Empire from 1027 until his death in 1039. The founder of the Salian dynasty of emperors, Conrad also served as King of Germany from 1024, King of Italy from 1026, and King of Burgundy from 1033.
Document 6: Ibn al-Sal'us: Al-Sahib Shams ad-Din Muhammad ibn Uthman ibn Abi al-Raja' al-Tanukhi, better known as Ibn al-Sal'us (died 10 December 1294), was an Arab merchant and the "wazir" (chief financial adviser) of the Mamluk sultan, al-Ashraf Khalil (r. 1290–1293). Ibn al-Sal'us began his career as a merchant based in Damascus, where he was eventually employed as a deputy "muhtasib" (market inspector). He gained a good reputation for his efforts at ensuring accountability in Damascene commerce. He was later appointed chief "muhtasib" in Cairo by Sultan al-Mansur Qalawun in 1290, but was soon after exiled to the Hejaz. When al-Ashraf Khalil succeeded Qalawun in November 1290, he recalled Ibn al-Sal'us to Cairo and appointed him "wazir". Ibn al-Sal'us restored the political influence of the office of "wazir" and accompanied al-Ashraf Khalil during military expeditions against the Crusaders and the Armenians. His arrogance toward senior Mamluk emirs drew their resentment. In the months following al-Ashraf Khalil's murder, Ibn al-Sal'us was arrested and tortured to death on the orders of his rival, Emir Sanjar al-Shuja'i.
Document 7: 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.
Document 8: Conrad of Antioch: Conrad of Antioch (Italian: "Corrado d'Antiochia" ; born 1240/41, died after 1312) was a member of the imperial Staufer dynasty and a nobleman of the Kingdom of Sicily. He was the eldest son of Frederick of Antioch, imperial vicar of Tuscany, and Margherita di Poli. He was thus a grandson of the Emperor Frederick II (reigned 1220–50), a nephew of King Manfred of Sicily (1258–66) and cousin of King Conradin (1266–68). His surname, which is contemporary, comes from his paternal grandmother, a mistress of Frederick II, who was from Antioch. He may be called "Conrad I" to distinguish him from his descendants with the same given name.
Document 9: 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 10: Frederick of Pettorano: Frederick of Pettorano ("c". 1212/3 – after 1240) was the eldest illegitimate son of Frederick II, king of Sicily and Germany. He was born on Sicily to an Italo-Norman noblewoman after his father's first marriage to Constance of Aragon. This mistress's name is unknown, but she came from a family of Norman counts on Sicily and had a relationship with the teenage Frederick between 1211 and 1212. Their relationship ended when King Frederick went to Germany and in 1213 took up with another woman, a certain Adelaide. Besides Frederick of Pettorano, Frederick II probably named two other sons after himself: another illegitimate son, Frederick of Antioch, and a legitimate son by his wife Isabella. This last is known only by the initial "F." and died young.
Document 11: John of Arsuf: John of Ibelin (c. 1211–1258) was the Lord of Arsuf (or Arsur) from 1236 and Constable of Jerusalem from 1251. He was a younger son of John I of Beirut. His elder brother, Balian, inherited Beirut. He served as regent of Jerusalem on two occasions: 1253–1254 for Conrad II and 1256–1258 for Conrad III. He was lieutenant for the regent on three occasions: 1247–1248 and 1249–1252 for Henry I of Cyprus and 1258 for Plaisance of Antioch.
Document 12: Archduke John of Austria: Archduke John of Austria (German: "Erzherzog Johann Baptist Joseph Fabian Sebastian von Österreich" ; 20 January 1782 – 11 May 1859), a member of the House of Habsburg-Lorraine, was an Austrian field marshal and Imperial regent ("Reichsverweser") of the short-lived German Empire during the Revolutions of 1848.
Document 13: Conrad III of Germany: Conrad III (1093 – 15 February 1152) was the first King of Germany of the Hohenstaufen dynasty. He was the son of Duke Frederick I of Swabia and Agnes, a daughter of the Salian Emperor Henry IV.
Document 14: 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 15: 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.
ground_truth: Conrad