True, Byzantium was the Eastern Roman empire, that persisted long after Rome's fall. Its capital was Constantinople, and the Eastern Roman Empire fell in 1453, with the sack of Constantinople by the Ottoman Turks.
It is the oldest painted object ever found in north america
I believe that character is Korben Dallas.
The reason that they have done this (this is a theory created by Egyptologists) is so the dead pharaoh could symbolically climb the sides of the pyramid, make his way to the sky, and live forever. The pyramid also represented the rays of the sun.