Question: What month did the person who retained trust in Longchamp go away to the Holy Land?

Knowledge 1: William de Longchamp
Longchamp governed England while Richard was on the Third Crusade, but his authority was challenged by Richard's brother, John, who eventually succeeded in driving Longchamp from power and from England. Longchamp's relations with the other leading English nobles were also strained, which contributed to the demands for his exile. Soon after Longchamp's departure from England, Richard was captured on his journey back to England from the crusade and held for ransom by Henry VI, Holy Roman Emperor. Longchamp travelled to Germany to help negotiate Richard's release. Although Longchamp regained the office of Chancellor after Richard's return to England, he lost much of his former power. He aroused a great deal of hostility among his contemporaries during his career, but he retained Richard's trust and was employed by the king until the bishop's death in 1197. Longchamp wrote a treatise on the law, which remained well known throughout the later Middle Ages. [SEP] Knowledge 2: John, King of England
When John's elder brother Richard became king in September 1189, he had already declared his intention of joining the Third Crusade. Richard set about raising the huge sums of money required for this expedition through the sale of lands, titles and appointments, and attempted to ensure that he would not face a revolt while away from his empire. John was made Count of Mortain, was married to the wealthy Isabel of Gloucester, and was given valuable lands in Lancaster and the counties of Cornwall, Derby, Devon, Dorset, Nottingham and Somerset, all with the aim of buying his loyalty to Richard whilst the king was on crusade. Richard retained royal control of key castles in these counties, thereby preventing John from accumulating too much military and political power, and, for the time being, the king named the four-year-old Arthur of Brittany as the heir to the throne. In return, John promised not to visit England for the next three years, thereby in theory giving Richard adequate time to conduct a successful crusade and return from the Levant without fear of John seizing power. Richard left political authority in England – the post of justiciar – jointly in the hands of Bishop Hugh de Puiset and William Mandeville, and made William Longchamp, the Bishop of Ely, his chancellor. Mandeville immediately died, and Longchamp took over as joint justiciar with Puiset, which would prove to be a less than satisfactory partnership. Eleanor, the queen mother, convinced Richard to allow John into England in his absence.
Knowledge 1: John, King of England
When John's elder brother Richard became king in September 1189, he had already declared his intention of joining the Third Crusade. Richard set about raising the huge sums of money required for this expedition through the sale of lands, titles and appointments, and attempted to ensure that he would not face a revolt while away from his empire. John was made Count of Mortain, was married to the wealthy Isabel of Gloucester, and was given valuable lands in Lancaster and the counties of Cornwall, Derby, Devon, Dorset, Nottingham and Somerset, all with the aim of buying his loyalty to Richard whilst the king was on crusade. Richard retained royal control of key castles in these counties, thereby preventing John from accumulating too much military and political power, and, for the time being, the king named the four-year-old Arthur of Brittany as the heir to the throne. In return, John promised not to visit England for the next three years, thereby in theory giving Richard adequate time to conduct a successful crusade and return from the Levant without fear of John seizing power. Richard left political authority in England – the post of justiciar – jointly in the hands of Bishop Hugh de Puiset and William Mandeville, and made William Longchamp, the Bishop of Ely, his chancellor. Mandeville immediately died, and Longchamp took over as joint justiciar with Puiset, which would prove to be a less than satisfactory partnership. Eleanor, the queen mother, convinced Richard to allow John into England in his absence. [SEP] Knowledge 2: William de Longchamp
William de Longchamp (died 1197) was a medieval Lord Chancellor, Chief Justiciar, and Bishop of Ely in England. Born to a humble family in Normandy, he owed his advancement to royal favour. Although contemporary writers accused Longchamp's father of being the son of a peasant, he held land as a knight. Longchamp first served Henry II's illegitimate son Geoffrey, but quickly transferred to the service of Richard I, Henry's heir. When Richard became king in 1189, Longchamp paid £3,000 for the office of Chancellor, and was soon named to the see, or bishopric, of Ely and appointed legate by the pope.
Knowledge 1: William de Longchamp
Longchamp governed England while Richard was on the Third Crusade, but his authority was challenged by Richard's brother, John, who eventually succeeded in driving Longchamp from power and from England. Longchamp's relations with the other leading English nobles were also strained, which contributed to the demands for his exile. Soon after Longchamp's departure from England, Richard was captured on his journey back to England from the crusade and held for ransom by Henry VI, Holy Roman Emperor. Longchamp travelled to Germany to help negotiate Richard's release. Although Longchamp regained the office of Chancellor after Richard's return to England, he lost much of his former power. He aroused a great deal of hostility among his contemporaries during his career, but he retained Richard's trust and was employed by the king until the bishop's death in 1197. Longchamp wrote a treatise on the law, which remained well known throughout the later Middle Ages. [SEP] Knowledge 2: John, King of England
The political situation in England rapidly began to deteriorate. Longchamp refused to work with Puiset and became unpopular with the English nobility and clergy. John exploited this unpopularity to set himself up as an alternative ruler with his own royal court, complete with his own justiciar, chancellor and other royal posts, and was happy to be portrayed as an alternative regent, and possibly the next king. Armed conflict broke out between John and Longchamp, and by October 1191 Longchamp was isolated in the Tower of London with John in control of the city of London, thanks to promises John had made to the citizens in return for recognition as Richard's heir presumptive. At this point Walter of Coutances, the Archbishop of Rouen, returned to England, having been sent by Richard to restore order. John's position was undermined by Walter's relative popularity and by the news that Richard had married whilst in Cyprus, which presented the possibility that Richard would have legitimate children and heirs.

Answer: October