公元九世纪，曾经横扫高原无敌手的吐蕃王国盛极而衰，风雨飘摇中，吐蕃王后裔的一支西逃阿里，与当地土王联姻，绝处逢生，雅垄河谷吐蕃的种子落临西部象雄国沃土上生根开花，发展壮大的结果是建立起阿里三环三个地方政权：雪山环绕的普兰王朝、石土环绕的古格王朝、湖泊环绕的拉达克王朝。
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