Narsieh
Narsieh was a Persian general who fled to the Tang dynasty with his father Peroz III, son of Yazdegerd III, the last Sassanid emperor of Persia, after the Muslim conquest of Persia.
He was escorted back to Persia by Pei Xingjian in 679 but was abandoned midway. He then spent his time fighting the Arabs in Tokharistan until he returned to the Tang China capital of Chang'an in 707, where he lived out the remainder of his life before dying from disease. His sons and daughters married into the Chinese nobility.
Narsieh's uncle Bahram VII died in 710, and Bahram's son Khosrow was mentioned fighting alongside Sogdians and Turks against the Arabs at the Siege of Kamarja in 729 in a futile attempt to reclaim the Sasanian throne. This is perhaps the last known reference to any direct descendant of Yazdegerd III.