A planet whose culture prizes rigid protocol and decorum, home to Minister Campio, the man Lwaxana Troi agreed to marry without ever having met him.
Kostolain is the homeworld of Campio, Third Minister of its Conference of Judiciary. It is referred to in the fifth-season Next Generation episode Cost of Living.
Its society, as represented by Campio and his protocol master Erko, sets enormous store by ceremony, correct forms of address and precise planning, with little room for spontaneity. In 2368 Lwaxana Troi, feeling her age and afraid of being alone, announces that she will marry Campio, having been matched with him by computer profile. She arranges for the wedding to take place aboard the Enterprise-D, to her daughter's dismay.
The pair prove hopelessly unsuited. Lwaxana finally arrives for the ceremony in traditional Betazoid fashion, wearing nothing at all, and the scandalised Campio is hurried away by Erko to go home.