(year -1196) Grogar declares himself ruler over a collection of farms and creates various monsters to terrorize them.
(year -1039) Gusty the Great defeats Grogar and hides his bell at the top of Mount Everhoof. Grogar is left very weak, and he slowly rebuilds his strength over millennia.
(year -922) Abraxius the Bold conquers most of what would later be northern Equestria.
(year -901) Abraxius the Bold is assassinated by an unknown pony, and his empire falls apart.
(year -842) The Crystal Heart manifests in the frozen north, and civilization forms in the protection it provides, made up of mostly Earth ponies and some alicorns (Princess Amore is a descendant of these alicorns). Those ponies eventually evolve into a slightly separate race of Crystal ponies due to prolonged exposure to the Crystal Heart.
(year -643) The first of the Alicorn-Draconequus Wars begins, throwing what would later be northern Equestria into chaos. Some alicorns choose to leave and seek refuge, either in the Crystal Empire or further south into Unicorn and Earth pony territory.
(year -124) The Alicorn race is almost entirely wiped out in the wars between the alicorns and draconequus. Celestia and Luna, hidden away with a few other alicorn children, are among the only survivors. The responsibility of raising the sun and moon is then taken up by the unicorns, though the strain exhausts them.
Celestia, Luna, and the other alicorn children are raised by the two older alicorn teens in their group. The group eventually part ways, Celestia and Luna going south, and the other three alicorns going north to the Crystal Empire.
(year -112) An unknown, extremely contagious, illness sweeps through the draconequus, leaving a young Discord as the only survivor. He was sent away by his parents and older sister before the illness took hold of him. (The illness is suspected to have been as a result of a curse from a remaining alicorn, but nothing has ever proven that.)
(year -9) Clover the Clever, Starswirl’s apprentice, completes seven trials, in one of which he defeats an evil sorceress with a memory erasing artifact.
(year 0) Earth ponies, pegasi, and unicorns have been living together in hostility, and windigos come to terrorize them. The tribe leaders (Chancellor Puddinghead, Commander Hurricane, Princess Platinum) try to move, but the windigos follow them and freeze the leaders. Their cohorts (Smart Cookie, Private Pansy, Clover the Clever) become friends and drive back the windigos, thawing the ice. The three tribes make peace and form Equestria.
