Final answer:
Morien has come to Arthur's realm for a specific purpose, which may include seeking his rightful place as the son of Sir Aglovale or proving his worth as a warrior. His arrival introduces a new character to the Arthurian legends.
Step-by-step explanation:
Morien has come to Arthur's realm for a specific purpose, but the exact reason may vary depending on the legend or story. One possibility is that Morien comes to seek his rightful place and recognition as the son of Sir Aglovale, one of King Arthur's knights. In some versions of the Arthurian legends, Morien is a heroic knight who helps Arthur and his knights in their quests.
Another possible reason is that Morien wants to prove his worth and demonstrate his skills as a warrior. He may be seeking fame, honor, and the opportunity to make a name for himself in Arthur's realm.
Overall, Morien's arrival in Arthur's realm serves to introduce a new character with unique skills, abilities, and a connection to the Arthurian legends.