The Summer Heroes
The Resettling of the Lirian elves occurred after the destruction of Liria in -112 BR. During the Resettling Lirians emigrated to Penwith in large numbers, settling mainly in Aeren, Brightwater, Gelden, Jund, Saltstone, and Starll. The influx of Lirian knowledge and technology enabled the nascent city-states of Penwith to coalesce into kingdoms (during the Age of Kingdoms).
Find more detail in the History of Penwith.