 Shahin's invasion of Asia Minor (615)

In 615, during the ongoing war with the Byzantine Empire, the Sassanid Persian army under spahbod Shahin invaded Asia Minor and reached Chalcedon, across the Bosporus from Constantinople.It was at this point, according to Sebeos, that Heraclius had agreed to stand down and was about ready to become a client of the Sasanian emperor Khosrow II, allowing the Roman Empire to become a Persian client state, as well as even allow Khosrow II to choose the emperor.