Question: What kind of group does Trym Torson and Emperor have in common?
Context: Emperor Hui of Han (210–188 BC) was the second emperor of the Han Dynasty in China.  He was the second son of the first Han emperor, Han Gaozu and Empress Dowager Lü.  He is generally remembered as a weak character dominated by his mother, Empress Dowager Lü, personally kind and generous but unable to escape the impact of her viciousness.  He tried to protect Ruyi, Prince Yin of Zhao, his younger half-brother, from being murdered by Empress Dowager Lü, but failed.  After that he indulged himself in drinking and sex and died at a relatively young age.  Empress Dowager Lü installed two of his sons, Liu Gong and Liu Hong (known collectively as Emperors Shao of Han), the sons of the Emperor's concubine(s) after he died without a designated heir.  Emperor Hui's wife was Empress Zhang Yan, a niece of his by his sister Princess Yuan of Lu; their marriage was the result of insistence by Empress Dowager Lü and was a childless one. Changzhou sesame candy is a kind of special traditional cookie which is very popular among people in local places in Changzhou.  Dating back to Tang dynasty, local people in Changzhou started to produce a kind of candies shaped like a kind of food called deep-fried sesame seed balls.  That's why they also called the sesame candy as the sesame-seed-ball candy.  Through a lot of procedure, the sesame candy came up.  During that time, the emperor did not have a good appetite and did not feel like eating anything.  But once he ate the sesame candy, he felt like having found what he likes most. Ruzi Ying (; 5 CE – 25 CE), also known as Emperor Ruzi of Han and the personal name of Liu Ying (劉嬰), was the last emperor of the Chinese Western Han Dynasty from 6 CE to 9 CE.  After Emperor Ai of Han and Emperor Ping died without heirs, Wang Mang chose the youngest of the available successors in order to maintain his power in the government.  The child Ying was soon deposed by Wang Mang who declared the Xin Dynasty in place of the Han.  During Xin Dynasty, Ying was under effective house arrest—so much so that as an adult, he did not even know the names of common animals.  Before and after the Xin Dynasty was overthrown in 23 CE, many ambitious people claimed to be restoring the Han dynasty.  In 25 CE, a rebellion against the temporary Emperor Gengshi used the former Emperor Ruzi as a focus, and when the rebellion was defeated, he was killed.  He is often viewed as an innocent child who was the victim of tragic circumstances.  (The expression "Emperor Ruzi" is a misnomer, as he never assumed the throne and was only named crown prince.  Nevertheless, he is commonly referred to as such.) Emperor Wen of Liu Song ((劉)宋文帝, (Liu) Song Wen-di) (407–453), personal name Liu Yilong (劉義隆), nickname Che'er (車兒), was an emperor of the Chinese dynasty Liu Song.  He was the third son of the dynastic founder Emperor Wu (Liu Yu).  After his father's death in 422, Liu Yilong's eldest brother Liu Yifu took the throne as Emperor Shao.  In 424, a group of officials, believing Emperor Shao to be unfit to be emperor, deposed Emperor Shao and placed Liu Yilong on the throne as Emperor Wen. Trym Torson (born Kai Johnny Mosaker), or just Trym, is a Norwegian drummer, formerly with Zyklon.  Torson started playing in the Viking metal band Enslaved and was later invited to play in black metal band Emperor.  He co-founded Zyklon together with Emperor member Samoth.  His style is heavily influenced by jazz, and he is known for his fast playing, often consisting of blast beats and double-bass drumming.  He is also a tattoo artist. Empress Dowager Dong (died 189), personal name unknown, formally known as Empress Xiaoren, was an empress dowager of the Eastern Han dynasty.  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. Lethrinus rubrioperculatus, common names the spotcheek emperor, red-eared emperor, red-ears, red-edged emperor, scarlet-cheek emperor, and spot cheek emperor, is a species of emperor fish. Liang Na (; 116–150), formally Empress Shunlie (順烈皇后, literally "the kind and achieving empress"), was an empress during the Han Dynasty.  Her husband was Emperor Shun of Han.  She later served as regent for his son Emperor Chong, and the two subsequent emperors from collateral lines, Emperor Zhi and Emperor Huan.  As empress dowager and regent, she appeared to be diligent and honest, but she overly trusted her violent and corrupt brother Liang Ji, whose autocratic nature would eventually draw a "coup d'etat" from Emperor Huan after Empress Dowager Liang's death, leading to the destruction of the Liang clan. Emperor is a Norwegian black metal band formed in 1991, regarded as highly influential by critics and emerging black metal bands.  The group split up in 2001, but reunited from 2005 to 2007 for a few festival dates and brief US tours, and again reunited in 2013 to 2014.  The group was founded by Ihsahn (guitar/vocal) and Samoth (then, drums). Zyklon was a Norwegian blackened death metal band formed in 1998 by Samoth and Trym of Emperor, along with members of Myrkskog.  Their style has been described as modern death metal with black and industrial undertones.  After more than a 2-year hiatus, the band officially split up in January 2010.
Answer: band