The titans of Equis ruled peacefully, embracing nature and it`s beauty. The titans were Scales of Pure Lazuli, Fires of Tartarus, Storms of Golden Rain, Petals of Cherry Blossoms and Stars of Midnight Skies. Few ordinary ponies roamed the Great Plains, where all ponies lived. Only a few unicorns and pegasi existed and those few were leaders.. They gave their souls to an ordinary pony whose name was Gold Lily. Gold Lily was trusted by Scales of Pure Lazuli, a thirteen headed leviathan because she saved her. Gold Lily was also a smart, athletic and friendly pony. When she found her best friend, Summer Rain, she adopted her and co-ruled the Forest of Life, now known as the Everfree Forest, together. When Moonsilver, Summer Rain`s brother, met Gold Lily, they fell in love. Their 21th foal was an alicorn. The Forest of Life rejoiced the first-ever bred alicorn, Midnight Vine. But Midnight Vine was different, she started creating changelings, but that`s a different origin story! For about 42 billion years, alicorns ruled the lands. Males existed at this time, but only to breed. Then, Dawn Blossom, an ordinary unicorn, was the first born unicorn by alicorns in 40 and a half billion years. She was hunted by all, and surprisingly managed to survive. She was Starswirl`s great,great,great,great,great,great,great,great,great,great,great,great,great,great,great,great,great,great,great,great,great,great,great,great, great grand mother.
If you want to see other people's opinions: http://mlp.wikia.com/wiki/User_blog:Newmarduk/On_the_Origins_of_Alicorns