Who does Cosimo go to see in Olivabassa, and what does he find there?

Cosimo visits the town of Olivabassa and the community of Spaniards who have made their home in the trees of that interior township. He finds them to be finely dressed and somber, civilized and simultaneously both very well and very ill adapted to life in the trees. He learns they are exiles, nobles who rebelled against King Charles III, and that a loophole in the wording of Prince Sanchez' sentence allows them to abide unmolested in the trees even while they are not allowed to set foot in the soil of the territory.