Spring fatigue, I don't awaken to dawn,
Everywhere hearing birds calling.
Night comes with the sounds of wind and rain,
And I know some flowers have fallen.
Meng Haoran (689-740)
It seems that the final creation of a central, imperial authority was not, as formulated by Tucci long ago, the result of a "conquering aristocracy". It was, rather, the result of the superimposition of a small outside group, with a leadership structure built around an inspirational warrior leader, the btsan-po, on a set of tribal aristocracies brought under his often unsteady central control.1
...the paternal subjects rebelled; the maternal subjects revolved. ... The father gNam ri was given poison and died. The son Srong btsan firstly wiped out the families of the rebels and the prisoners.
...Thirteen years of age he ascended the throne and, brought under his power all the petty chiefs of the borderland who offered him presents and sent their messages (of submission).