Kostolain

From Memory Alpha, the free Star Trek reference

Kostolain is a planet in or near Federation space and is home to the Conference of Judges. In 2368 Campio served as third minister to the Conference on Kostolain during the time he was to be married to Lwaxana Troi.

The culture of Kostolain is reserved and exceptionally formal. Strict protocol is always followed and, in many cases, enforced by the presence of a Protocol Master. (TNG: "Cost of Living")