Jia Sidao
Hu was born in Ninghai (current Ninghai County of Ningbo, Zhejiang Province). He was a mid-level official under the prime minister Jia Sidao during the 1250s. After the fall of Song, he hid himself in the country, and he spent the next few years, until the end of his life, writing his influential corrections and commentaries for the "Zizhi Tongjian". Hu's commentaries are considered highly valuable for readers of the work.