souverain
/suvɛʁɛ̃/Definitions
1. noun
A former title of the ruler of Moscow, or a title of the ruler of the Grand Duchy of Lithuania.
“The suzerain of the region held significant influence over local politics.”
2. adjective
Relating to or characteristic of a suzerain or suzerainty.
“The suzerain power exerted its authority over the smaller state.”