The present paper aims to report early applications of the domical vaults on a square plan supported by four arches and spherical-triangle pendentives, which remain in Levant of Roman Empire. They are made of cut stones, and the technique of which traces back to Hellenistic tradition. New measurements confirm that these domical vaults with pendentives form a hemisphere. They were probably constructed in the second century AD. A shallow dome made of cut stone voussoir was adequate to create a geometrical form, but it was considerably inapplicable to a monument more than 10 m in diameter. This method was a tentative solution before the pendentive dome was innovated in the second half of the sixth century AD.