Sima Rui (simplified: 司马睿, traditional: 司馬睿, pinyin: Sīmǎ Ruì) was the grandson of Sima Zhou and great-grandson of Sima Yi. He was enfeoffed as Prince of Langye (琅邪王). After the fall of the Western Jin north to non-Chinese forces, Sima Rui, then Regional Inspector of Yang Province, moved south to Jiankang (建康, modern Nanjing). In 317 he was proclaimed Emperor Yuan of Jin (晉元帝), establishing the Eastern Jin dynasty (東晉), which ruled the south for over a century. He died in 323. His reign marked the continuation of the Jin court in the south after the loss of the Central Plain.
Sima Rui 司馬睿
Grandson of Sima Zhou; fled south after the fall of the north; founded the Eastern Jin dynasty in 317 as Emperor Yuan of Jin.