of Saluzzo, c. 1182, and was regent for her grandson Manfred III. An unidentified daughter, who married Albert, Marquis of Malaspina. The vida of the troubadour Raimbaut de Vaqueiras claims that there was another daughter, Beatrice, who m. Henry I del Carretto, Marquis of Savona, and that she is the Bel Cavalher (Fair Knight) of Vaqueiras's songs. However, the lyrics of Vaqueiras's songs (as opposed to the later vida) describe Beatrice as Boniface's daughter, and thus William's granddaughter. Otto of Tonengo (d. 1251), who became Bishop of Porto, and Cardinal in 1227, has sometimes been identified as a son of William V, and confused with Frederick. However, his dates make it more likely that he was a son of William VI of Montferrat, whether legitimate or not is uncertain. William and Judith's powerful dynastic connections created difficulties in finding suitable wives for his sons, and too many potential spouses were related within prohibited degrees. In 1167, he unsuccessfully tried to negotiate marriages for his eldest sons to daughters of Henry II, King of England—but the girls were very young at the time and were related through Judith's descent from William V of Aquitaine. He then applied for sisters of William I, King of Scotland, who were not related, but were already married. Alliances with the Western and Eastern Empires William took part in the Second Crusade, alongside his half-brother Amadeus of Savoy (who died during the campaign), his nephew Louis VII of France, his brother-in-law Count Guido of Biandrate, and his wife's German and Austrian relatives. As supporters of the imperial party (later known as the Ghibellines), he and his sons fought with the Emperor Frederick Barbarossa (Judith's nephew) in his lengthy struggle against the Lombard League. Following Barbarossa's capitulation with the Peace of Venice in 1177, William was left to deal with the rebellious towns in the area alone. Meanwhile, the Byzantine emperor Manuel I Komnenos sought support for his own politics in Italy. William broke with Barbarossa and formed an alliance with Manuel. His eldest surviving son, Conrad, was taken prisoner by Barbarossa's chancellor, Archbishop Christian of Mainz, but then captured the chancellor in battle at Camerino. In 1179 Manuel suggested a marriage between his daughter Maria, second in line to the throne, and one of William's sons. As Conrad and Boniface were already married, the youngest son, Renier, was married off to the princess, who was ten