disciple his neighbor Hao He (, 1849–1920), known by the courtesy name Hao Weizhen (), for whom he made one of only three handwritten copies of the Wu/Li family t'ai chi manual. Hao Weizhen became a well-known master and professional instructor, further refining the art and developing his own solo form (see the Characteristics section below). Closely associated with the martial arts community in Hebei, including Yang Zhaolin (, 1884-1922) the eldest grandson of Yang Luchan, beginning in 1914 he also taught in Beijing where his students included Sun Lutang (, 1860-1933) the founder of Sun-style t'ai chi, and in Yongnian that same year Hao led the first t'ai chi ch'üan program in a public school. Hao's contributions — in developing and spreading the art, and in training the founders of all subsequent Wu (Hao) lineages, as well as the further contributions of his son and grandson — are why many include his surname when referring to this style. Lineage The Wu (Hao) lineage () is represented today by at least a dozen branches () with many smaller offshoots. The four largest branches are listed here, named for the purposes of this article as follows: Li family branch Hao family branch Li Shengduan branch Li Baoyu (Li Xiangyuan) branch The founders of these branches trained under Hao Weizhen, but the first branch in the list traces lineage directly back to the original Wu and Li families. Li family descendants still teach, but no direct descendant of the Wu or Hao families has a leading role in the art today. Although Sun style is considered a descendant () of Wu (Hao) style because the founder learned t'ai chi ch'üan from Hao Weizhen, that style is covered in a separate article and not included here. Lineage tree Li family branch This branch uses the name "Wu Style Taijiquan" (), sometimes spelled "Wuu" in translation to indicate the pronunciation. Some have referred to it as "Li Frame" () or "Northern Branch", and we discuss those names below, but members of this lineage do not use those labels themselves today. They also do not include the name Hao because their lineage includes family bonds to the original Li and Wu families, but Hao Weizhen did help train founder Li Xunzhi (, 1882–1944). Xunzhi was ten years old when his father Li Yiyu died, and so completed his training under his elder brothers and his