Prelate

From Memory Alpha, the free Star Trek reference

You may also be looking for the similar title, First Prelate.

A Prelate is the leader of the Qomar Planetary Alliance, and the Qomar people.

In 2376, Prelate Koru held this position, while the USS Voyager visited the Qomar homeworld. (VOY: "Virtuoso")

It was not specified if the Qomar are a democracy, but it is implied. However, based on their respect for mathematics, it is possible they run as a meritocracy.