Trần Thái Tông
The Lý dynasty which ruled Dai Viet (Vietnam) married its princesses off to regional rivals to establish alliances with them. One of these marriages was between a Lý empress regnant (Lý Chiêu Hoàng) and a member of the Chinese-descended Trần (Chen) clan (Trần Thái Tông), which enabled the Trần to then topple the Lý and established their own Trần dynasty.