This series of novels was written by robert van gulik, and set in t'ang dynasty china. the hero was based on a historical character, and the books often incorporated plots based on ancient chinese detective stories. who was this ancient chinese detective?

The right answer is Di Renjie.

Explanation: Just to elaborate a little on the answer, it can be added that Di Renjie was a 7th-century Chinese statesman, who served during the Tang and the Zhou dynasties. He was a judge, a prefect, a military advisor, and a chancellor, among other roles. His exemplary life and career have inspired many works of fictions, such as the Judge Dee historical mystery stories by Dutch writer Robert van Gulik.    

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