The Yuosi Dynasty controls all territory in the southern peninsula of the region of Ciel aside from the Great Tree Illisai, which is the domain of the elven Kingdom of Illisai. It's capital is the city of Yuos, located at the top of the Great Tanari Falls near the ocean.
The humans' exodus from Isan coincided with the beginning of the Third Age. Multiple cultures' legends tell of Cila appearing as a brilliant star in the eastern sky and parting the Suntouched Sea. The humans traveled for weeks across the seabed until arriving at the cliffs of the north-eastern continent and were lifted up by Cila’s hand. They named the land Ciel, in honor of their Guardian. Then, upon seeing the Great Falls, they settled a town and named it Yuos, meaning 'Thanks' in the ancient Gonaic. The Illisari elves made contact with the strange life forms. They welcomed them to their land but told them to take nothing from their sacred forest. For their observance of this rule, the Illisari granted the Yuosi a modest amount of food and lumber every month for 100 years. Happily, they used the wood to expand their city and heat their homes. Soon enough, the humans were sustaining themselves with fishing and ranching. Trade between humans and elves soon flourished. The elves were captivated by many of the humans' creations including fine pottery, oil paintings, dyes, jewelry, clothes, and armaments. In exchange, they traded the bounty of the forest and taught the humans nature magics, allowing them to reform trees and clear paths through the forest. Throughout the second century, the Yuosi expanded to the far reaches of the forest and the surrounding coastlines, establishing many fishing villages and farmlands.
In 184, the Yuosi'Dan Hikari Yamamoto declared himself Emperor of the Dawn and lord of the peninsula. His proud words drew the ire of the Illisari, but he continued to observe the rule of the forest, so the elves let him talk. Within 15 years, however, Hikari had convinced many of his people that the elves' rule was unfair. The humans had a right to the forest as well. So the Yuosi started taking from the woods. Fruits and berries at first, then mushrooms, then the wood itself. The elves, in turn, banished the thieves that they could catch to another part of the world. In 201, Emperor Yamamoto Proclaimed the Illisari to be a greedy, reclusive race of "branch swingers" and an enemy of humans. The next sunrise brought with it the truth of the Ilissari's military might. 60,000 elven soldiers surrounded the human city of 46,000 men, women, children, and slaves. They demanded the surrender and exile of Hikari Yamamoto. Shamed by his folly, Hikari accepted his fate and invited any brave enough to join him in unknown exile. Before leaving, Hikari named the successor to the Dawn, a man who had always challenged him in his foreign relations, Akira Saito. In 202, Emperor Saito healed relations between Illisai and Yuos and paved the way for centuries of prosperity. To those Yuosi those who were discontent living in the forest, Saito offered to supply them in migrating to new, unclaimed lands. In 206, a caravan of 1500 traveled north, to the stormfields. 1300 of them would found the hilltop city of Leodra while the other 200 resolved to travel west to a dryer climate. They would found the city of Dal.
In 586 A3, Emporer Hirohito Saito commissioned Yuos' brightest engineers to design a grand crane which could hoist ships 300 feet up and down the Great Tanari Waterfall. Over the next 5 years, this crane and Jiatuk's Harbor was constructed by many hundreds of laborers. The Yuosi had little desire for a navy, as their cliff-bound home stood defiant to fleets of any size. However, moderate number of ships were built for trade, fishing, and diplomacy. The Yuosi were eager to receive the increasing numbers of Leodran Junks. From then on, trade flourished between the two nations. In 378 A4, A group of 250 people, seeking freedom from the empire, commissioned and sailed a transport ship to the island of Makoma. They would found the secluded city of Ebondine in the heart of the forest of the moon.