Yuen Kay-shan () nicknamed Yuen Lo-jia () was a Grandmaster of Wing Chun. The youngest of five brothers, he became known as "Foshan Yuen Lo-jia" (Yuen the Fifth of Foshan). He was the fifth child of wealthy firework monopoly owner Yuen Chong Ming, and was known as an undefeated champion of 1000 death duels during the 1920-1950s representing the Wing Chun. Wing Chun studies Yuen's family ancestral estate home was named Song Yuen (Mulberry Gardens), and located in Foshan, China. Initially, Kay-shan's father paid for him and his older brother Yuen Chai-wan to become students of Fok Bo-Chuen (; also transliterated "Kwok Bo-chuen").Wong Wah-bo and "Dai Fa Min" Kam from the Red Boat Opera Company also taught Yuen Kay-shan. Yuen Kay-shan and his older brother (Yuen Chai-wan) or Yuen Chai-wan had developed an interest in the martial arts. Yuen Kay-shan's older brother Yuen Chai-wan was known as "Pock Skin Chai" and later became the founder of Yiu Choi and Vietnamese Branches of Wing Chun. Their father Yuen Chong Ming housed and paid a large sum of money to imperial constable Fok Bo Chuen to teach both of the Yuen brothers Wing Chun. From Fok Bo-chuen, Yuen learned all the extensive open hand patterns in Wing Chun, he structured them into and created three forms, Siu Lien Tau, Chum Kiu and the Biu Jee. In addition he mastered the knives, six and a half point pole and the flying darts. He had also been taught the Wooden Dummy, Bamboo Dummy and several different jong variations, as well as Red Sand Palm. Later, Ma Bok-Leung, Jiu Gan-Heung, Lo Hao-Po, Ng Ngau Si, Leung Yan as well as Yuen Kay-shan and his brother, invited Fung Siu-Ching to come and teach. Fung stayed at the Yuen ancestral home, where the two brothers combined the teachings of their past and present teacher. From Fung Siu Ching they learned his skills in close body applications which included the kum Na, Fa Kum Na, body wrapping, sweeping, breaking and throwing skills. Fung Siu Chiong was a disciple of red boat master Dai Fai Min Kam. The Yuens cared for Fung Siu Ching until his death in 1936. 1936 also marked the year when Yuen Kay-shan and Yuen Chai-wan had gone their separate ways. Yuen's brother eventually was invited to teach in Vietnam, where he founded the Nguyễn Tế-Công branch (Vietnam WingChun 永春) branch of the art. Yuen