Background: James Butler Hickok was born May 27, 1837, in Homer, Illinois (present-day Troy Grove, Illinois) to William Alonzo Hickok, a farmer and abolitionist, and his wife Polly Butler. His father was said to have used the family house, now demolished, as a station on the Underground Railroad. He was the fourth of six children.
Context: In 1873, Buffalo Bill Cody and Texas Jack Omohundro invited Hickok to join their troupe after their earlier success. Hickok did not enjoy acting, often hiding behind scenery, and in one show shot the spotlight when it focused on him. He was released from the group after a few months. In 1876, Hickok was diagnosed by a doctor in Kansas City, Missouri, with glaucoma and ophthalmia. Though he was just 39, his marksmanship and health were apparently in decline, as he had been arrested several times for vagrancy, despite earning a good income from gambling and displays of showmanship only a few years earlier. On March 5, 1876, Hickok married Agnes Thatcher Lake, a 50-year-old circus proprietor in Cheyenne, Wyoming Territory. Hickok left his new bride a few months later, joining Charlie Utter's wagon train to seek his fortune in the goldfields of South Dakota. Martha Jane Cannary, known popularly as Calamity Jane, claimed in her autobiography that she was married to Hickok and had divorced him so he could be free to marry Agnes Lake, but no records have been found that support her account. The two possibly met for the first time after Jane was released from the guardhouse in Fort Laramie and joined the wagon train in which Hickok was traveling. The wagon train arrived in Deadwood in July 1876. Jane confirmed this account in an 1896 newspaper interview, although she claimed she had been hospitalized with illness rather than in the guardhouse. Shortly before Hickok's death, he wrote a letter to his new wife, which read in part, "Agnes Darling, if such should be we never meet again, while firing my last shot, I will gently breathe the name of my wife--Agnes--and with wishes even for my enemies I will make the plunge and try to swim to the other shore."
Question: Why did he leave his wife ?
Answer: joining Charlie Utter's wagon train to seek his fortune in the goldfields of South Dakota.

Background: Yen was born in Guangzhou, China. His mother, Bow-sim Mark, is a Fu Style Wudangquan (internal martial arts) and Tai Chi grandmaster, while his father, Klyster Yen (Zhen Yun Long ), is a newspaper editor. When he was two years old, his family moved to Hong Kong and then to Boston when he was 11. His younger sister, Chris Yen, is also a martial artist and actress, and appeared in the 2007 film Adventures of Johnny Tao: Rock Around the Dragon.
Context: Yen describes himself as a mixed martial artist. He learned Tai Chi from a young age under his mother's tutelage. He then wanted to learn Taekwondo in his teenage years, earning a 6th Dan in the process. At the time, the Beijing Wushu Team had a scout in the United States and invited Yen over to Beijing, China, where he began training at the Beijing Sports Institute, the same facility where champion-turned-actor Jet Li trained; this is where the two of them crossed paths for the first time. Upon his return to the United States, Yen won gold medals in various wushu competitions. Yen later went on to discover and seek knowledge on other martial arts styles; he would later obtain black and purple belts from judo and Brazilian Jiu-Jitsu, respectively, and went on to study the art of Parkour, Wrestling, Muay Thai, Kickboxing and Boxing under various trainers. His exposure to mixed martial arts (MMA) was heightened when he went back to the United States from 2000 to 2003. While making his Hollywood debut, he also took time off to learn the various martial arts forms. Yen's progress was evident when he returned to Asia, where he implemented his newfound knowledge of MMA, showcased in films such as SPL: Sha Po Lang (2005), Flash Point (2007), and Special ID (2013). Near the end of 2007, Yen added a new martial arts system to his arsenal. He was offered the role of Wing Chun grandmaster and mentor of film star Bruce Lee, Ip Man, in a 2008 film named after the grandmaster. He worked hard and studied Wing Chun under Ip Man's eldest son, Ip Chun, for 9 months before tackling the role. Ip Chun has since praised Yen for his effort, his skills as a martial artist, and his ability to grasp the full concept of Wing Chun much faster than anyone else he has taught. Yen believes that combining many martial arts together will produce the most effective and harmonious style. Yen has said, "When you watch my films, you're feeling my heart." He believes in practical combat, and in his opinion, MMA is the most authentic type of practical combat. He has mentioned that he would have competed in the Ultimate Fighting Championship if he did not have a recurring shoulder injury.
Question: when did he start learning martial arts?
Answer:
learned Tai Chi from a young age under his mother's tutelage.