I like the concept of the birth of the Ego in parallel with the development, as human beings, of our capacity to think. We gradually became our thoughts at the expense of our direct connection with what is. Before thinking there was no Ego.
Hopefully the nascent movement towards detachment of these thinking patterns and into awareness without attachment (to our thinking or form) will grow in strength over time. With a more peaceful world as consequence. See amongst others, A New Earth by Eckhart Tolle.
Which contains a very comprehensive and clear description of our ego (and how it influences our lives). And sees a collective movement towards a new level of (unattached) consciousness for human kind.
On the side it also offers an untraditional and much more appealing explanation of a number of the teachings of Jezus. See also: Ego-Tree.