In 640, Bhrikuti and her Chinese co-wife converted Srongtsen Gampo to Buddhism.
Srongtsen Gampo became Buddhist due to the actions of Bhrikuti. 
mnli hypothesis: Srongtsen Gampo became Buddhist due to the actions of Bhrikuti.  premise: In 640, Bhrikuti and her Chinese co-wife converted Srongtsen Gampo to Buddhism.