Long ago, a man went on a trip.
Long ago, a man named William went on a trip. He was a monk from France. A king asked him to travel to far lands. 
William of Rubruck was a monk from France. 
William reached the capital city of Karakorum. He saw many things there. He saw city walls and busy markets. He saw temples and many different people. Some people were Muslim and some were Chinese. He even saw a contest about religion.
William wrote a long report about his trip. He wrote it in a language called Latin. He told the king about the land and its people. He also proved that the Caspian Sea is an inland sea. His writing is very important today. It helps us learn about the 13th century. Many people compare his work to Marco Polo.
William of Rubruck was a Franciscan friar from the County of Flanders. He lived during the 13th century and was likely born in the 1210s or 1220s. 
William did not travel alone on this long trip. He went with Bartolomeo da Cremona and an attendant named Gosset. They also had an interpreter called Homo Dei. The group used oxen and carts to move their things. Later, they traveled on horseback to reach the Mongol court. They first stopped in the city of Constantinople. There, William met Baldwin of Hainaut to get letters for the Tatar chiefs. This was the fourth mission sent by Europeans to the Mongols.
In late 1253, the group began riding toward the capital city. This city was called Karakorum in modern-day Mongolia. They arrived in late December and met the Great Khan in January 1254. William saw many interesting things in the city. He saw large walls and busy markets. He also saw many different temples. The city had many people from different places. There were Muslim and Chinese craftsmen living there together.
While at the court, William saw a famous debate. The Khan wanted to see a contest between different faiths. Christians, Buddhists, and Muslims all took part. A person from China even joined the competition. William also learned new things about the earth. He proved that the Caspian Sea is an inland sea. He showed that it does not flow into the Arctic Ocean. This was a very important discovery for people writing about maps.
After his trip, William wrote a long book called an Itinerarium. He wrote it in Latin because he could not meet the King in person. 
William of Rubruck was a Franciscan friar from the County of Flanders. He lived during the 13th century and was likely born in the 1210s or 1220s. 
In 1248, William accompanied King Louis IX of France on the Seventh Crusade. Later, the King commissioned a new mission to the Mongol Empire. The goal was to convert the Tatar people to Christianity. On May 7, 1253, William began this missionary journey. He first stopped in Constantinople to meet Baldwin of Hainaut. Baldwin had recently traveled to Karakorum, the capital of the Mongol Empire. William received letters for the Tatar chiefs from the Latin Emperor. This mission was actually the fourth European attempt to reach the Mongols. Previous missions were led by Giovanni da Pian del Carpine, Ascelin of Lombardia, and André de Longjumeau.
William traveled with a specific group of companions. He was joined by Bartolomeo da Cremona and an attendant named Gosset. They also had an interpreter known as Homo Dei. This name means "man of God" in Latin. It likely represented an Arabic name, Abdullah, which means "servant of God." The party used oxen and carts for much of the trek. After reaching the Crimean town of Sudak, they moved through the region. They met Sartaq Khan, the ruler of the Kipchak Khanate. Sartaq sent William to see his father, Batu Khan, near the Volga River. William’s approach to Batu Khan was quite aggressive. He promised the Khan eternal damnation if he did not convert. Batu Khan was offended by this preaching and refused to convert.
On September 16, 1253, the party switched to horseback. They rode toward the court of the Great Khan, Möngke Khan. They arrived at the capital, Karakorum, in late December. On January 4, 1254, William was granted an audience with the Great Khan. William observed that Karakorum was a very cosmopolitan city. He described its large walls, busy markets, and various temples. The city included separate quarters for Chinese and Muslim craftsmen. He even met a French silversmith named Guillaume Boucher there. Boucher was making ornaments for the Khan's women and altars for Nestorian Christians.
While at the Mongol court, William witnessed a unique event. The Khan encouraged a formal theological debate. This competition involved Christians, Buddhists, and Muslims. Three judges, one from each faith, were chosen to decide the winner. A person from China participated in this debate alongside William. This event shows how diverse the Mongol court was. William also encountered Nestorian Christians during his travels. However, he was highly critical of them. He believed their religious practices were heretical.
William’s journey also provided important geographical discoveries. He traveled north of the Caspian Sea. Through this passage, he proved the Caspian Sea was an inland sea. He showed that it did not flow into the Arctic Ocean. While earlier explorers had some knowledge of the area, William was the first to record this in writing. His observations helped clarify the map of the world for future generations. He was a careful observer who asked many questions. He did not simply accept folk tales or fables as true.
After his long journey, William wrote a detailed report. He could not meet King Louis IX in person upon his return. Therefore, he wrote a long letter in Latin called an *Itinerarium*. 
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