In Guerin

In Guerin (the League), formally In Guerin Tiothamich Bal’thráieth Sedais (Lathadun: Commynkied Bluckaneyrys Seeydagh) the Sedic Premier Footballing League) and abbreviated the GTBO is the top tier of the joint Ordrish-Lathadun footballing league systems. It is contested by 20 clubs which operates on a system of with its second-tier league, the Provincial League (Ordrish: Guerin a'Tiré Sedais, GTS, Lathadun: Commyn Queiggeys Seeydagh). Regular seasons of In Guerin go from August to May, with matches typically being played on Friday and Saturday afternoons. It is a  style tournament, with a total of 38 matches, each team playing against the other 19 clubs in the organization at home and away.

The tournament was incepted on 19 July 1980 under the auspices of Bonwenat as a part of the post-Revolution reconstruction efforts. Lathadu, traditionally integrated with Ordrish football, had an independent league from 1975 until 1988, following which Lathadun football clubs reintegrated with In Guerin.

Thirty-four clubs have have competed in the league since its inception in 1980: Twenty-eight Ordrish clubs and six Lathadun clubs. Eight have won the championship title: Rías Vernon (4), Calethaníathé (2), Calleebane (1), and Noters Amthrevwár (1).