According to the Records of the Grand Historian, Tantai Mieming (Ziyu) was born in 512 BC, 39 years younger than Confucius, but the Kongzi Jiayu says he was 49 years younger.
When Confucius learned of Ziyu's success, he remorsefully said: "I used to judge a person by his speech and erred in Zai Yu; I used to judge a person by his appearance and erred in Ziyu." .