The Memphis theology is based around Ptah (equivalent to the Greek Hephaistos, the divine blacksmith), (shown above on the left), who himself becomes the primordial fire and gives it substance. This cosmological system was developed at Memphis, when it became the capital city of the kings of Egypt. Ptah is the creator-god of Memphis, and during the long period the city served as the capital of Egypt it was known as Het-ka-Ptah or "House of the Soul of Ptah". Ptah is one of several Egyptian deities attributed with a myth about fashioning creation. Ptah, as the god Ta-tenen (the primordial mound), creates in the so-called "Memphite Theology" the world, its inhabitants, and the kas of the other gods. Reference is again made to the Ennead, this time with Ptah at its head.