Question: When did Lady Ma's spouse die?

full_context: Document 1: Wang Yanhan: Wang Yanhan (王延翰) (died January 14, 927), courtesy name Ziyi (子逸), was a ruler of the Chinese Five Dynasties and Ten Kingdoms period state Min. He ruled briefly after the death of his father Wang Shenzhi (Prince Zhongyi) without a regal title, but later declared himself king. Just two months after declaring himself king, he was overthrown and killed in a revolt by his adoptive brother Wang Yanbing and younger biological brother Wang Yanjun. Wang Yanjun took over the state thereafter.
Document 2: Wukui: Wukui's father and predecessor was Duke Huan of Qi, who was the first of the Five Hegemons, the most powerful rulers of the Spring and Autumn period. Duke Huan had at least three main wives who bore no sons, six favoured concubines, and more than ten sons. Wukui's mother was the elder Wey Ji, one of the two princesses of the State of Wey who were among Duke Huan's favoured concubines. However, the crown prince of Qi was Prince Zhao (later Duke Xiao), who was born to Zheng Ji, a princess of the State of Zheng. Four other sons of Duke Huan also contended for the throne: Prince Pan (later Duke Zhao), Prince Shangren (later Duke Yi), Prince Yuan (later Duke Hui), and Prince Yong.
Document 3: Princess Meng: Very little is known about Princess Meng. She was mentioned as Juqu Mengxun's wife in 413, when she thwarted an assassination attempt against him by the eunuch Wang Huaizu (王懷祖) and captured Wang. She was probably the mother of his first two heirs apparent Juqu Xingguo (沮渠興國) and Juqu Puti (沮渠菩提), although this is not completely clear. It appears unlikely that she was the mother of his actual successor Juqu Mujian. During Juqu Mujian's reign, a princess dowager was mentioned, without any names, and it could have been Princess Meng or Juqu Mujian's birth mother. If it was Princess Meng, then she died in the Northern Wei capital Pingcheng (平城, in modern Datong, Shanxi) after Juqu Mujian's capital Guzang (姑臧, in modern Wuwei, Gansu) had fallen to Northern Wei forces and he had been taken captive, but she was still buried with honors due a princess. The succession table below assumes that she survived to Juqu Mengxun's death in 433, but that is obviously conjecture.
Document 4: Lady Mi: Lady Mi was the second wife of the warlord Liu Bei, who lived in the late Eastern Han dynasty and Three Kingdoms period of China. She was from Qu County (朐縣), Donghai Commandery (東海郡), which is present-day Lianyungang, Jiangsu. She had two brothers: Mi Zhu and Mi Fang, who previously served the warlord Tao Qian before joining Liu Bei's side. Mi Zhu married his sister to Liu Bei after Liu's wife and children (identities unknown) were captured by Lü Bu when Lü invaded Xiapi in 196.
Document 5: Wang Yuanying: Wang Yuanying (王元膺) (892 – August 13, 913), courtesy name Changmei (昌美), né Wang Zongyi (王宗懿), named Wang Yuantan (王元坦) from 910 to 912, was a crown prince of the Chinese Five Dynasties and Ten Kingdoms period state Former Shu, during most of the reign of his father, the founding emperor Wang Jian (Emperor Taizu). He was killed during an uprising he started against the powerful official Tang Daoxi and posthumously demoted to commoner rank.
Document 6: Qian Yuanguan: Qian Yuanguan (錢元瓘) (November 30, 887 – September 17, 941), born Qian Chuanguan (錢傳瓘), formally King Wenmu of Wuyue (吳越文穆王), courtesy name Mingbao (明寶), was the second king of the state of Wuyue, during the Five Dynasties and Ten Kingdoms period of China. During his reign, his kingdom was centred on modern Zhejiang. He ascended to the throne in 932, when his father Qian Liu (King Wusu) left the state in his hands, to 941. He was the father to all three of Wuyue's subsequent kings.
Document 7: Li Congyan: Li Congyan (李從曮) (898 – November 26, 946), né Li Jiyan (李繼曮) (name changed 926), formally the Prince of Qi (岐王), was a son and the heir of Li Maozhen, the only ruler of the Chinese Five Dynasties and Ten Kingdoms period state Qi. After Li Maozhen submitted to Later Tang and died shortly after, he continued to control the former Qi territory, as a Later Tang vassal, and subsequently served as a general for both Later Tang and its successor state Later Jin.
Document 8: Lady Huang: Lady Huang, also known in fiction and folklore as Huang Yueying, was the wife of Zhuge Liang, the chancellor and regent of the state of Shu Han during the Three Kingdoms period of China. She was a woman renowned for her intelligence in astronomy, geography, military strategy and engineering. She has helped the Shu kingdom countless times. Her name was not recorded in history; "Huang Yueying" is simply a fictional name.
Document 9: Lady Chen (Wusu): Qian Liu died in 932, and Qian Chuanguan took over administration of the state (and changed his name to Qian Yuanguan), although for some time did not use the title of King of Wuyue but instead referred to himself by the military governor title (and, in succession, the Later Tang-bestowed titles of Prince of Wu and Prince of Yue) when reporting to Later Tang, to whom Wuyue was a vassal. (He would assume the king title only years after Lady Chen's death, in 937.) It was said that Qian Yuanguan was respectful and filially pious toward his mother. He also treated her family well, presenting them with many gifts, but never gave them offices on account of her. She died in the early "Qingtai" era (934-936) of the Later Tang emperor Li Congke and was posthumously created the Lady Dowager of Jin, with the posthumous name of "Zhaoyi" ("accomplished and benevolent").
Document 10: Xu Xinyue: Xu Xinyue (; 902?-August 1, 946), formally the Lady Renhui of Wuyue (吳越國仁惠夫人), was a concubine, possibly later a wife, of Qian Yuanguan (King Wenmu) (né Qian Chuanguan, name changed to Qian Yuanguan upon his succession to the throne), the second king of the Chinese state Wuyue of the Five Dynasties and Ten Kingdoms period, and the mother to his son and successor Qian Hongzuo (King Wenxian).
Document 11: Liu Chuyu: Liu Chuyu was the oldest of six children of Emperor Xiaowu's wife Empress Wang Xianyuan, although her birth date is not known. During her father's reign, her father created her the Princess Shanyin and married her to He Ji (何戢), the son of his official He Yan (何偃). After her father's death in 464, her younger brother, also by Empress Wang, Liu Ziye became emperor (as Emperor Qianfei). She became one of the people who often attended him while he visited places outside the palace. On one occasion, she told him, "While our genders are different, we are born of the same father. However, you have more than 10,000 women in your palaces, and I only have one husband, and this is unfair." In response, Emperor Qianfei selected 30 young handsome men for her, calling them her "mianshou" (面首, literally meaning "prime faces"), for them to be her lovers. (From this point on in Chinese history, "mianshou" became a term for women's male lovers, often referring to lovers of honored women.) He also promoted her to the greater title of Princess Kuaiji.
Document 12: Lady Ma (Qian Yuanguan's wife): Lady Ma (馬夫人, personal name unknown) (890-November 28, 939), formally the Lady Gongmu of Wuyue (吳越國恭穆夫人), was a wife of Qian Yuanguan (King Wenmu) (né Qian Chuanguan, name changed to Qian Yuanguan upon his succession to the throne), the second king of the Chinese state Wuyue of the Five Dynasties and Ten Kingdoms period.
Document 13: Princess Dowager Guo: Prior to 363, Zhang Xuanjing's grandmother Princess Dowager Ma had been princess dowager, but after she died that year, Zhang Xuanjing honored Lady Guo as princess dowager. (She was only described as Zhang Chonghua's concubine and not as Zhang Xuanjing's mother, but there would be little reason for him to honor her as princess dowager if she were not his mother.) Because Zhang Xuanjing's uncle, the regent Zhang Tianxi, was acting dictatorially, she conspired with officials led by Zhang Qin (張欽) to kill Zhang Tianxi, but the news leaked, and Zhang Tianxi had Zhang Qin put to death. (This implies that Princess Dowager Guo was not put to death.) Zhang Xuanjing, in fear, offered to yield the throne to Zhang Tianxi, but Zhang Tianxi refused. However, a month later, he sent soldiers into the palace and assassinated the 13-year-old duke. He himself took the Jin-created title the Duke of Xiping, which his nephew had held. Princess Dowager Guo's fate was not mentioned.
Document 14: Ma Xifan: Ma Xifan was born in 899, during the reign of Emperor Zhaozong of Tang, as the fourth son of the warlord Ma Yin. At that time, Ma Yin had just taken control of Tan Prefecture (in modern Changsha, Hunan) following the assassination of Ma Yin's predecessor Liu Jianfeng, and was not yet fully in control of Wu'an Circuit (武安, headquartered at Tan Prefecture), which would eventually become the central circuit for the Chu state, but was in the process of gradually consolidating his control. Ma Xifan's mother was a Lady Chen, who was Ma Yin's concubine, not his wife — as Ma Yin's first son, Ma Xizhen (馬希振), was said to be born of his wife, who was not named in historical sources. (Lady Chen later bore at least one younger son among Ma Yin's at least 35 sons, Ma Xiguang.) Ma Xifan and his brother, Ma Yin's second son Ma Xisheng, were born on the same day, but Ma Xisheng was born earlier on that day. (Another brother, unnamed in historical sources, was therefore likely born on the same day of a different mother, between Ma Xisheng's and Ma Xifan's births.)
Document 15: Qian Hongzun: Qian Hongzun (錢弘僔) (925－June 7, 940), formally Heir Apparent Xiaoxian (孝獻世子, "the filial and wise heir apparent"), was an heir apparent to the throne of the Chinese Five Dynasties and Ten Kingdoms Period state Wuyue during most of the reign of his father Qian Yuanguan (né Qian Chuanguan, King Wenmu), but did not inherit the throne on account of his predeceasing his father.
ground_truth: 941
sub_queries: Lady Ma >> spouse Answer: Qian Yuanguan
On what date did Qian Yuanguan expire? Answer: 941