 The Roman emperor Theodosius II's unwillingness to continue the payment made Yazdegerd II declare war against the Romans, which had ultimately little success for either side.The Romans were invaded in their southern provinces by the Vandals, causing Theodosius II to ask for peace and send his commander, Anatolius, personally to Yazdegerd II's camp.In the ensuing negotiations in 440, both empires promised not to build any new fortifications in Mesopotamia and that the Sasanian Empire would get some payment in order to protect the Caucasus from incursions.