A Chinese Biographical Dictionary/Chên Chiang
207 Chên Chiang 真姜. 5th cent. B.C. The virtuous wife of Prince 昭 Chao of the Ch'u State. When the prince went from home, he left her in a tower surrounded by water; and it was agreed between them that if he sent for her, he would give the messenger a token to be shown to the princess. On one occasion there was a flood, and the water began to rise high round the tower. The prince hurriedly sent off a messenger to rescue his wife, but forgot the token; the result being that the lady declined to leave the tower, and perished in the flood.