Other important cities included Yeha, Hawulti-Melazo, Matara, Adulis, and Qohaito, the last three of which are now in Eritrea. By the reign of Endubis in the late 3rd century, it had begun minting its own currency and was named by Mani as one of the four great powers of his time along with Persia, Rome, and China. It converted to Christianity in 325 or 328 under King Ezana and was the first state ever to use the image of the cross on its coins.[18][19]