Sun Yat-sen briefly took a title of what Chinese military ranking?
Taewonsu Taewŏnsu (literally grand marshal, usually translated as "generalissimo") is the highest possible military rank of North Korea and is intended to be an honorific title for Kim Il-sung and Kim Jong-il. The rank is senior to that of "wonsu" (marshal). The title also exists in Chinese military history as "dàyuánshuài" (same Sino-Korean characters 大元帥), and was briefly taken by Sun Yat-Sen.
Sun Liang Sun Liang (243–260), courtesy name Ziming, was the second emperor of the state of Eastern Wu during the Three Kingdoms period of China. He was the youngest son and heir of Sun Quan, the founding emperor of Wu. He is also known as the Prince of Kuaiji or (less frequently) Marquis of Houguan (候官侯), which were his successive titles after he was deposed in 258 by the regent Sun Chen. He was succeeded by his brother Sun Xiu, who managed to oust Sun Chen from power and kill him. Two years after Sun Liang's dethronement, he was falsely accused of treason and demoted from a prince to a marquis, after which he committed suicide.