Question: Who is Empress Murong's paternal grandfather?

Knowledge 1: Empress Murong
Empress Murong (慕容皇后, personal name unknown), formally Empress Daowu (道武皇后), was an empress of the Chinese/Xianbei dynasty Northern Wei Dynasty.Her husband was the founding emperor Emperor Daowu(Tuoba Gui).She was the youngest daughter of the Later Yan emperor Murong Bao(Emperor Huimin).When Northern Wei launched a major attack against Later Yan in 396, causing Murong Bao to abandon the capital Zhongshan(中山, in modern Baoding, Hebei) in 397, she was unable to follow her father in flight, and when Zhongshan fell to Northern Wei later that year, she was captured by Tuoba Gui and made one of his consorts.In 400, after he had declared imperial title, he considered whom to create empress.He had favored Consort Liu, the daughter of the Xiongnu chief Liu Toujuan (劉頭眷) the most, and she also bore his oldest son Tuoba Si.However, the Tuoba Tribe's traditions dictated that when the ruler were to consider whom to make his wife, he was to make the candidates try to forge golden statues by hand, as a way of discerning divine favor.Consort Liu was unable to forge a golden statue, while Consort Murong was able to, and so was created empress.Her mother Lady Meng, also captured by Northern Wei, was created the Lady of Piaoyang.Nothing more is known about Empress Murong.She was implied to be still alive in 402, when Later Qin's emperor Yao Xing rejected Emperor Daowu's overture to marry one of his daughters, because Yao Xing's refusal was based on his information that Emperor Daowu already had Empress Murong as empress. [SEP] Knowledge 2: Murong Bao
Murong Bao (355–398), courtesy name Daoyou (道佑),Xianbei name Kugou (庫勾),formally Emperor Huimin of (Later) Yan ((後)燕惠愍帝), temple name Liezong(烈宗) or Liezu (烈祖), was an emperor of the Chinese/Xianbei state Later Yan.He inherited from his father Murong Chui (Emperor Wucheng) a sizable empire but lost most of it within a span of a year, and would be dead in less than three, a victim of a rebellion by his granduncle Lan Han.Historians largely attributed this to his irresolution and inability to judge military and political decisions.While Later Yan would last for one more decade after his death, it would never regain the power it had under Murong Chui.
Knowledge 1: Empress Murong
Empress Murong (慕容皇后, personal name unknown), formally Empress Daowu (道武皇后), was an empress of the Chinese/Xianbei dynasty Northern Wei Dynasty.Her husband was the founding emperor Emperor Daowu(Tuoba Gui).She was the youngest daughter of the Later Yan emperor Murong Bao(Emperor Huimin).When Northern Wei launched a major attack against Later Yan in 396, causing Murong Bao to abandon the capital Zhongshan(中山, in modern Baoding, Hebei) in 397, she was unable to follow her father in flight, and when Zhongshan fell to Northern Wei later that year, she was captured by Tuoba Gui and made one of his consorts.In 400, after he had declared imperial title, he considered whom to create empress.He had favored Consort Liu, the daughter of the Xiongnu chief Liu Toujuan (劉頭眷) the most, and she also bore his oldest son Tuoba Si.However, the Tuoba Tribe's traditions dictated that when the ruler were to consider whom to make his wife, he was to make the candidates try to forge golden statues by hand, as a way of discerning divine favor.Consort Liu was unable to forge a golden statue, while Consort Murong was able to, and so was created empress.Her mother Lady Meng, also captured by Northern Wei, was created the Lady of Piaoyang.Nothing more is known about Empress Murong.She was implied to be still alive in 402, when Later Qin's emperor Yao Xing rejected Emperor Daowu's overture to marry one of his daughters, because Yao Xing's refusal was based on his information that Emperor Daowu already had Empress Murong as empress. [SEP] Knowledge 2: Fujiwara no Nagara
, also known as Fujiwara no Nagayoshi, was a Japanese statesman, courtier and politician of the early Heian period.He was the grandfather of Emperor Yōzei.
Knowledge 1: Empress Murong
Empress Murong (慕容皇后, personal name unknown), formally Empress Daowu (道武皇后), was an empress of the Chinese/Xianbei dynasty Northern Wei Dynasty.Her husband was the founding emperor Emperor Daowu(Tuoba Gui).She was the youngest daughter of the Later Yan emperor Murong Bao(Emperor Huimin).When Northern Wei launched a major attack against Later Yan in 396, causing Murong Bao to abandon the capital Zhongshan(中山, in modern Baoding, Hebei) in 397, she was unable to follow her father in flight, and when Zhongshan fell to Northern Wei later that year, she was captured by Tuoba Gui and made one of his consorts.In 400, after he had declared imperial title, he considered whom to create empress.He had favored Consort Liu, the daughter of the Xiongnu chief Liu Toujuan (劉頭眷) the most, and she also bore his oldest son Tuoba Si.However, the Tuoba Tribe's traditions dictated that when the ruler were to consider whom to make his wife, he was to make the candidates try to forge golden statues by hand, as a way of discerning divine favor.Consort Liu was unable to forge a golden statue, while Consort Murong was able to, and so was created empress.Her mother Lady Meng, also captured by Northern Wei, was created the Lady of Piaoyang.Nothing more is known about Empress Murong.She was implied to be still alive in 402, when Later Qin's emperor Yao Xing rejected Emperor Daowu's overture to marry one of his daughters, because Yao Xing's refusal was based on his information that Emperor Daowu already had Empress Murong as empress. [SEP] Knowledge 2: Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.

Answer: Murong Chui