He arrived in the scene in 5574 and began preaching, similar to what Tevahr had done years earlier. Gish's teachings focused on the words of Yahvo. He wrote "Yahvo Alone". He condemned the Great King Ahlsendar and Tevahr, he denounced his people for claiming that taygahn was more important than following Yahvo's commands, and that it was used as an excuse to do what they wanted. Yahvo commanded, as he said, was no interaction with the outsiders. Gish was not the first to say such things, but for some reason, as Trisari noted, he became very popular.
Fearing his popularity, Adesh had him arrested many times, only to strengthen his support. Then he ordered him killed by the Relyimah but this only made him a martyr. A very unpopular action that provoked public outrage against the King and the Church.
King Lanaren immediately denounced the murder of Gish and informed the public of the existence of the Relyimah, their involvement and promised to rid them from all government activities. During the time of Asemlef, the D'ni were philosophically confused between The Watcher, Gish and Tevahr.
During the time of Jaron, many of the factions were being dissolved and seemingly beginning to call themselves Followers of Yahvo after Gish. Those did not support outside involvement, they believed it was best to obey Yahvo and hope for a peaceful solution.
Hisha, the consort of King Rikooth was a follower of Gish and taught him and their 3 children accordingly. As a reult, Rikooth expelled her and Kerath, but later he appointed Kerath as his heir. By then, he people had abandoned the views of Ri'neref and Ahlsendar and now followed those of Gish, along with Nemiya, The Watcher, and various others. Therefore Kerath's views that his people were ruled wrongly for millennia was a cultural impact that the public had to overcome and not a religious one.