A passage from Buddhadharma Magazine, Winter 2019:
In the year 233, as the 28th Tibetan king Lhatotori Nyentsen sat on the rooftop of his palace, several objects descended from the sky, carried on a beam of sunlight. The first was a silver choten, a symbolic representation of the Buddha’s mind. The other was a chest containing three Buddhist scriptures. As the books came to rest on the roof, a voice resounded from above, proclaiming, “In five generations’ time, there will arise a king who will understand the meaning of these objects.”
(Italics mine).