Horus as bright as the sun was explained by a tale, known as "The Contendings of Horus and Seth". In this tale, it was said that Set, the patron of Upper Egypt, and Horus, the patron of Lower Egypt, had battled for Egypt brutally, with neither side victorious, until eventually the gods sided with Horus. As Horus was the ultimate victor he became known as "ḥr.w wr" "Horus the Great", but more usually translated "Horus the Elder". In the struggle, Set had lost a testicle, and Horus's eye was gouged out. Horus represented the eclipsing binary Algol in the Calendar of
Horus name reaches back to the time of the Naqada II period at 3400 BC, and its development can be observed on objects from Naqada II to the 1st Dynasty. However, at the time of introduction, the serekhs of kings were yet anonymous. Later the name of the king was written beside the serekh or omitted completely. In many cases the serekh lacks the Horus falcon, and in other cases, such as the serekh of king Ka, the serekh seems to be held by Horus upside-down. During the middle and late Naqada III period (3200 - 3030 BC.), kings started to write