Born Leung Tak-wing in 1826 in Heshan, Guangdong, he had a elder brother, Leung Tak-nam, who would later become a successful businessman. His father later moved to Kuai Zi, Foshan and ran a traditional Chinese medicine Dit Da clinic there. At the age of 18, he was trained by Leung Yee-tai in Southern Shaolin skills. Yee-tai later introduced Jan to his partner Wong Wah-bo. Wong was also a Gulao resident like Jan, and he taught Jan the whole Wing Chun skill set. From 1870 onwards, under the nickname Leung Jan, he made a living as Dit Da practitioner within the Wing Sang Tong, also known as Jan Sang Tong, in Foshan and would occasionally take in students to train them in Wing Chun privately. His name eventually became well known due to his wins in competitive bouts and he was respected by other martial artists. He was called Mr. Jan of Foshan. He later became a government official and was known as King of Wing Chun Kuen. His training and medical hall was looked after by his student Lee Wah, nicknamed Woodman Wah.
Personal life
Leung had three wives, nine sons and eight daughters. His first wife Ms. Wong, bore him no children. His second wife Ms. Cheng, bore him seven sons. His third wife Ms. Poon, bore him two sons. His nine sons were:
1st: Leung Yuen-fuk, courtesy name Yan-wah – with Ms. Poon, learned Wing Chun from his father, and on later years went to Vietnam with him to do business there, he had a son, and died at the age of 24.
2nd: Leung Bik-wo, courtesy name Tai-wah – with Ms. Cheng, born in 1845, learned Wing Chun from his father and grand-teacher Wong Wah-bo, later moved to Hong Kong with a friend to set up a clothing business there. He had two sons. He further trained Ip Man in 1909 and died in 1911 at the age of 55.
3rd: Leung Chi-yin, courtesy name Hin-wah – with Ms. Poon, he had no children.
4th: Leung Yu-chun, courtesy name Mou-wah – with Ms. Cheng, born during the Tongzhi period in Year 9, April 12, he was more verse into his father's medical practices and medical ethics, but later switched to business, he had six sons and three daughters and died at age 54.
5th: Leung Chung-wah – with Ms. Cheng, died prematurely.
6th: Leung Shu-wah – with Ms. Cheng, died prematurely.
7th: Leung Ko-peng, courtesy name Yue-wah – with Ms. Cheng, born during the Tongzhi period, year of Wuchen, he had two sons.
8th: Leung Nim-wah – with Ms. Cheng, died prematurely.
9th: Leung Pak-jau, courtesy name Sai-wun – with Ms. Cheng, due to death of his mother, he was supposed to be sent to a wet nurse for breast-feeding, however along the way he was abducted and was sold to a new family.
There is currently no available historical information on any of Leung's eight daughters.
In 1888, his physical health began to decline and his five remaining sons had since left Foshan to make a living and they had no intention to take over his training and medical hall. Notably, Leung Yuen moved to Vietnam, while Leung Bik moved to Hong Kong. While searching for a successor, Leung took in a money changer Chan Wah-shun as his student. Leung later often went back and forth between Foshan and his hometown Gulao Village, and Chan continued to be trained by Lee. Leung also taught Chan in Dit Da. Chan eventually closed his money changing business and helped run a Dit Da clinic. After the death of Lee Wah on the following year in 1889, Chan took over the operations of the training and medical hall, while Leung continued to go back and forth between Foshan and Gulao. Wing Sang Tong was later renamed to Hang Chai Tong. Around the age of 70, Leung retired permanently back to his hometown, there he taught a group of four youths, including his nephew Wong Wah-sum, a modified form of Wing Chun which focused on side-facing positions. Leung died in 1901.
In the 1978 film Descendants of Wing Chun, he was portrayed by Melvin Wong. He was portrayed by Bryan Leung in the 1978 film Warriors Two as the master role as a more disciplined and older man. He takes up the student Chan Wah-shun alongside a few other ones he is already training, but is caught up in an elaborate scheme by Foshan's new mayor. The mayor plans to remove all top martial artists from the town, so he may rule with an iron fist. Putting both Cashier Wah, and Leung Jan himself on the mayor's hit list. In the 1981 TVBtelevision drama seriesKung Fu Master of Fat Shan, he was portrayed by Kwan Hoi-san. Leung Jan, as an already somewhat skilled martial artist, is featured in a student role in the 1981 film The Prodigal Son. In this fictional tale of his life, Yuen Biao as Leung Jan, is a young man determined to learn real martial arts after a humiliating defeat by undercover Wing Chun master Leung Yee-tai who is a seemingly harmless man, despite Leung Jan being known as Foshan's "kung fu king". Leung was portrayed by Yuen Biao again in the Hong Kong TV series Real Kung Fu, which aired on TVB in 2005, along with Wing Chun a year later or two from 2006 to 2007.