Yelü Bei
Yelü
Bei  (born 899 -January 7, 937), also known as Yelü Tuyu (耶律突欲 or 耶律圖欲), posthumously honored Wenxian Qinyi Huangdi (文獻欽義皇帝) with the temple name Yizong (Simplified: 辽义宗, Traditional: 遼義宗), formally known as Ren Huangwang (人皇王, "imperial king of men")
during his lifetime (including his period as the King of Dongdan), known as Dongdan Muhua (東丹慕華) (931) and then Li Zanhua (李贊華) (931-937) as a Later Tang subject, was the eldest son of Emperor Taizu of Liao, the founder of the Liao Dynasty.
He was declared successor to the Emperor Taizu in 916, but never succeeded to the throne.
Rather, after the accession of his younger brother Yelü Deguang
(Emperor Taizong), he fled to the Shatuo Later Tang, where he was killed in 937.
Empress Dowager Xiao (Shizong)
Empress Dowager Xiao (蕭太后, personal name unknown) (d. October 7, 951?),
formally Empress Rouzhen (柔貞皇后), was an empress dowager of the Khitan Liao dynasty.
She was a concubine of Yelü Bei (posthumously honored Emperor Yizong) and the mother of Emperor Shizong (Yelü Ruan).
Empress Dowager Xiao (Tang dynasty)
Empress Dowager Xiao( 蕭太后)( died June 1, 847), formally Empress Zhenxian( 貞獻皇后," the virtuous and wise empress"), known at times in her life as Empress Dowager Jiqing( 積慶太后), was an empress dowager of the Chinese Tang Dynasty.
She was the mother of Emperor Wenzong and a concubine of Emperor Muzong.
Empress Dowager Bo
Empress Dowager Bo( 薄太后) was an imperial concubine of Emperor Gaozu of Han( Liu Bang).
She was also known as Consort Bo( 薄姬) during the life of the Emperor, and more formally as either Empress Dowager Xiaowen( 孝文太后) or( rarer) Empress Gao( 高皇后).
Despite being a concubine of lower standing, her son, Liu Heng, became Emperor Wen of Han, cementing her place in history.
The year of her birth is not known.
She died in 155 BC.
Empress Dowager
Bo is formally the first grand empress dowager in Chinese history, as Empress Dowager Lü, the only other empress dowager till then who lived to see her grandson become emperor, never claimed the title.
Empress Dowager Dong
Empress Dowager Dong (died 189), personal name unknown, formally known as Empress Xiaoren, was an empress dowager of the Eastern Han dynasty of China.
She was never empress throughout her life because she was the wife of a marquis; she only became empress dowager because her son, Liu Hong (Emperor Ling), became the emperor by chance.
During her son's reign, she developed a rivalry with her daughter-in-law, Empress He, because she wanted Emperor Ling's younger son, Liu Xie, to be crown prince while Empress He wanted her own son, Liu Bian to succeed his father.
Emperor Ling died in 189 before he managed to designate either of his two sons as crown prince.
Liu Bian eventually took the throne as Emperor Shao; Empress Dowager Dong, as the emperor's grandmother, became grand empress dowager, while her daughter-in-law became empress dowager.
Empress Dowager
He eventually conspired with her brother, General-in-Chief He Jin, to unseat her mother-in-law from power.
Grand Empress Dowager Dong died of illness shortly after her downfall; the common people held Empress Dowager He and her family responsible for the grand empress dowager's death.
Empress Dowager Wang (Southern Ming)
Empress Dowager Wang( c. 1594? – 1651), personal name unknown, formally known as Empress Dowager Xiaozheng( 孝正太后), was an empress dowager of the Southern Ming Dynasty.
She was the main consort of Zhu Changying, Prince of Gui, the father of the Yongli Emperor.
She converted to Roman Catholicism and adopted the name Helena.
Empress Dowager Xiao
Empress Dowager Xiao( 蕭太后) may refer to:
Grand Empress Dowager Shangguan
Grand Empress Dowager Shangguan( 上官太皇太后)( personal name unknown)( 89 BC – 37 BC), also known as Empress Shangguan( 上官皇后), Empress Xiaozhao( 孝昭皇后) and Empress Dowager Shangguan( 上官太后), was an Empress, Empress Dowager and Grand Empress Dowager during the Han Dynasty and wife of Emperor Zhao.
Her father was Shangguan An( 上官安), the son of Shangguan Jie( 上官桀).
Her mother was the daughter of Huo Guang.
She was a key figure in a number of political incidents during the middle Han Dynasty, and she spent her entire adult life as a Grand Empress Dowager and a widow without family.
Both sides of her family were wiped out in two separate mass executions as punishment for being relatives of individuals accused of seeking to usurp the throne.
She remains the youngest person in Chinese history to assume the titles of both Empress Dowager and Grand Empress Dowager.
Lu Huinan
Lu Huinan( 412 – February 24, 466), formally Empress Dowager Zhao( 昭太后, literally" accomplished empress dowager"), semi-formally Empress Dowager Chongxian( 崇憲太后), was an empress dowager of the Chinese dynasty Liu Song.
She had been a concubine of Emperor Wen, and she became empress dowager because her son Liu Jun later became emperor( as Emperor Xiaowu).
Ogawa Mataji
Viscount was a general in the early Imperial Japanese Army.
He was also the father- in- law of Field Marshal Gen Sugiyama.

Question: Who is the father-in-law of Empress Dowager Xiao (Shizong)?