Final answer:
William adopts a noble pseudonym to participate in a jousting tournament, which is a common theme in medieval and Arthurian stories. Such aliases are chosen to reflect the chivalric ideals, seek honor, or protect one's identity.
Step-by-step explanation:
The student is inquiring about the name William adopts to conceal his identity and participate in a jousting tournament. This question refers to a narrative theme commonly found in tales involving knights and nobility. In this instance, William is creating a pseudonym that reflects a noble status. Within the context of medieval stories and Arthurian legends, characters often take on noble aliases to uphold certain chivalric ideals and seek honor in tournaments or battles while remaining incognito. Characters like William, assuming a new identity, do so for various reasons, such as to hide their true lineage, earn glory independently, or protect themselves from political repercussions. The name William chooses is emblematic of his desire to be seen as a noble warrior, capable and brave, reflecting the knightly virtues of the era. This action is typical of the romanticized view of knighthood, where personal valor and heroic deeds are prized above one's actual birthright or social standing.