Egyptians often refer to Cairo as '''' (; ), the Egyptian Arabic name for Egypt itself, emphasizing the city's importance for the country. Its official name '''' () means 'the Vanquisher' or 'the Conqueror, supposedly due to the fact that the planet Mars,  (, 'the Conquering Star'), was rising at the time when the city was founded, possibly also in reference to the much awaited arrival of the Fatimid Caliph Al-Mu'izz who reached Cairo in 973 from Mahdia, the old Fatimid capital. The location of the ancient city of Heliopolis is the suburb of Ain Shams (, 'Eye of the Sun').