Lyonesse was once a kingdom that rivaled Kernow in the shadow times. After the battle of Kithcaree, which resulted in a substantial portion of Lyonesse departing below the waves of the Irish Sea, the remnant became the most westerly province of Kernow. Officially called Lethowsow in the Cornish language, the Lyonesse name was more often used for self-reference by the locals. It was in this rugged and shining land that the early phases of the War of the Orbs was fought and it was here that the fell nature of the threat was first apprehended.
At that time most of the population of Lyonesse was squeezed into the coastal arc running from Lamorna in the south to Zennor in the north (a distance of about twenty-five miles). The interior was heavily forested and further broken up by two mountain groups which formed the borders of the three districts of Lyonesse – Penberth (the sunny south), Grumbla (of the deep woods) and Morvah (the stormy north).
Of the two mountain groups, it was the Gobetweens that were the most formidable with peaks reaching over six thousand feet. For most of the populace the passes formed by the Nanven and Penberth rivers were the only way through. A third pass along the most southerly shoulder allowed the road from Penzance to claw its way just above the surf to Lamorna. Problematic as it sometimes was, the Lamorna – Penzance road (known through out Penbreth as “The Darting Arrow”) was the only practical land route into Lyonesse.
The smaller mountain group – the Morvahs – lay farther north and were less than half as high. Unlike the Gobetweens, the Morvahs provided many lush summer meadows. Accessing the meadows from both sides of the mountains from time out of memory had created a network of footpaths which meant that the people need not rely (usually) on the Potheras Pass to travel betwixt the districts of Grumbla and Morvah.
It was into the deep forest of Grumbla, in the very heart of Lyonesse, that the orbs decended on “Arrival Day”.