Guangyun, Jiyun, Yunhui, and Zhengyun: Pronounced sao (falling tone). The wife of one's elder brother. Book of the Later Han (Hou Hanshu), Biography of Ma Yuan: Ma Yuan treated his widowed sister-in-law with such respect that he would not enter her room without wearing his cap. Also, qiusao. Qiu signifies great, a term of address for the eldest sister-in-law. Book of the Former Han (Qian Hanshu), Annals of Gaozu: When the Emperor Gaozu was in humble circumstances, he would visit his eldest sister-in-law. Biography of King Chu Yuan: Guests would frequently visit his eldest sister-in-law to dine. Sometimes also written in a variant form (sao).