Given the task definition, example input & output, solve the new input case.
In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Example: Passage: Nearing London, Oliver encounters Jack Dawkins, a pickpocket more commonly known by the nickname the "Artful Dodger", and his sidekick, a boy of a humorous nature named Charley Bates, but Oliver's innocent and trusting nature fails to see any dishonesty in their actions. The Dodger provides Oliver with a free meal and tells him of a gentleman in London who will "give him lodgings for nothing, and never ask for change". Grateful for the unexpected assistance, Oliver follows the Dodger to the "old gentleman's" residence. In this way Oliver unwittingly falls in with an infamous Jewish criminal known as Fagin, the gentleman of whom the Artful Dodger spoke. Ensnared, Oliver lives with Fagin and his gang of juvenile pickpockets in their lair at Saffron Hill for some time, unaware of their criminal occupations. He believes they make wallets and handkerchiefs.
Output: Who believes Fagin's gang make wallets and handkerchiefs?.
This question is based on the following sentence in the passage "He believes they make wallets and handkerchiefs". It evaluates the understanding that the pronoun "he" refers to name "Oliver". You can ask questions like this one about most pronouns in a paragraph.

New input case for you: Passage: How much of this narrative was Geoffrey's own invention is open to debate. He seems to have made use of the list of Arthur's twelve battles against the Saxons found in the 9th-century Historia Brittonum, along with the battle of Camlann from the Annales Cambriae and the idea that Arthur was still alive. Arthur's status as the king of all Britain seems to be borrowed from pre-Galfridian tradition, being found in Culhwch and Olwen, the Welsh Triads, and the saints' lives. Finally, Geoffrey borrowed many of the names for Arthur's possessions, close family, and companions from the pre-Galfridian Welsh tradition, including Kaius (Cei), Beduerus (Bedwyr), Guenhuuara (Gwenhwyfar), Uther (Uthyr) and perhaps also Caliburnus (Caledfwlch), the latter becoming Excalibur in subsequent Arthurian tales. However, while names, key events, and titles may have been borrowed, Brynley Roberts has argued that "the Arthurian section is Geoffrey's literary creation and it owes nothing to prior narrative." Geoffrey makes the Welsh Medraut into the villainous Modredus, but there is no trace of such a negative character for this figure in Welsh sources until the 16th century. There have been relatively few modern attempts to challenge the notion that the Historia Regum Britanniae is primarily Geoffrey's own work, with scholarly opinion often echoing William of Newburgh's late-12th-century comment that Geoffrey "made up" his narrative, perhaps through an "inordinate love of lying". Geoffrey Ashe is one dissenter from this view, believing that Geoffrey's narrative is partially derived from a lost source telling of the deeds of a 5th-century British king named Riotamus, this figure being the original Arthur, although historians and Celticists have been reluctant to follow Ashe in his conclusions.Whatever his sources may have been, the immense popularity of Geoffrey's Historia Regum Britanniae cannot be denied. Well over 200 manuscript copies of Geoffrey's Latin work are known to have survived, as well as translations into other languages. For example, 60 manuscripts are extant containing the Brut y Brenhinedd, Welsh-language versions of the Historia, the earliest of which were created in the 13th century. The old notion that some of these Welsh versions actually underlie Geoffrey's Historia, advanced by antiquarians such as the 18th-century Lewis Morris, has long since been discounted in academic circles. As a result of this popularity, Geoffrey's Historia Regum Britanniae was enormously influential on the later medieval development of the Arthurian legend. While it was not the only creative force behind Arthurian romance, many of its elements were borrowed and developed (e.g., Merlin and the final fate of Arthur), and it provided the historical framework into which the romancers' tales of magical and wonderful adventures were inserted.
Output:
What were the names of close family and companions Geoffrey borrowed from the pre-Galfridian Welsh tradition?