ETYM Old Eng. trone, French trône, Latin thronus, Greek; cf. thronos a bench, Skr. dharana supporting, dhro to hold fast, carry, and Eng. firm, a.
(Homonym: thrown).
1. The chair of state of a monarch, bishop, etc.
2. The position and power of one who occupies a throne.

To sit on the throne as a ruler.