The lands near that monument were fertile and plain, allowing the elves to grow plenty of food in the summer months. They were unsure who had made it and eventually saw it as a ancient structure from the Early Merethic, possibly built by the Ehlnofey that once lived there. They settled in the central plains, finding a strange monument on a large mountainous hill. Altaro was declared the first King of Mereth, the 'home of the true elves', after the completion of the city and the elves began expanding across the province. Altaro founded the city of Altanium and named the body of water Lake Alta (Ilin Alta in the elven tongue). The rest of the province proved too harsh and inhospitable to them, so they decided to settle in Falkreath by a large lake. The Chantry of Auriel was led by Altaro Hilyanar ( the Sun-Servant in Aldmeris) into the forest region of Falkreath in Skyrim roughly 800 years before the 1st Era. They headed north and called this new land Mereth. This time they fled to a more remote province, one sparely populated with only a handful of underground Dwemer city-states. This brought the Chantry into conflict with the Ayleids and they were forced to flee Cyrodiil. However, they proved too liberal for the Chantry of Auriel as the Ayleids worshiped not only the Aedric gods of the Aldmer, but also the Daedric Princes of Oblivion. They saw it as the perfect place to live, as the Ayleids were very religiously liberal. Initially they escaped to the heartlands of Cyrodiil, where the Ayleid city-states dominated. They chose exodus instead of giving up their faith. This didn't comply with the dogmas of the Aldmeri faith and they suffered persecution on the islands. This particular group belonged to the Chantry of Auriel, but, unlike most Aldmer, saw Auriel as the only true god worthy of their worship.
This exodus was nothing new, numerous other groups of Aldmer had departed from the strict society of the islands to seek a better life. In the Middle Merethic Era, around 900 years before the 1st Era, a group of religious Aldmer left the Summerset Isles looking for a new home.