Era beginning/end
The immortal elves were not known for keeping much in the way of written records, relying mainly on elaborate oral histories which usually took the form of songs and poetry. To outsiders, they rarely spoke of their past but they came to Hârn from the east around 10,000 BT as one of several stops they planned to make on their way to the Blessed Realm. Unable to resist the pristine beauty of the island, some decided to stay "a while." For three thousand years the Sindarin dwelt in peaceful solitude on Hârn with Siem, their deity and even when the god decided to continue his journey westward after returning to the entrance, some Hârnic elves chose to stay, the Sindarin.