 It was kind of a statelet, a mountain statelet, kind of a medieval, a feudal kingdom. And it was both a kind of a redoubt, a place that held off invaders, but also paradoxically a crossroads. So it is part of the Silk Road, and it exploited that. They were kind of the middlemen. It's where you've changed your mule caravans, carrying silks and porcelain and whatnot going one direction or another.