The Sasanian reconquest of Yemen was a major armed conflict in pre-Islamic Arabia which took place in 575 or 578 after Aksumite men killed Sayf ibn Dhi Yazan after a reign of some four years and took control of Yemen. The rising took place when the protecting Persian garrison withdrew from Yemen. The Sasanians, this time with a force of 4,000 men, managed to reconquer Yemen and install Sayf’s son, Maʿdī Kareb as ruler.