The House of SepIch (a.k.a. House of SipIch) was a Klingon house. This ancient house conquered Taganika for the Klingon Empire. Those planets brought great wealth to the ancient houses that ruled them. For generations they were enemies with the House of Ingka.
the Klingon opera qul tuq was based on the ancestors of this house. It included brave warriors such as Argan, son of T'lak, Seegath, son of Seeth and Janar, son of Seegath. At some point it was ruled by Kmpok and, after his death, by Torghn, who had to leave the wars with Gowron in order to return and control his house. He married K'Tar. Together they had a son, Pok.
Torghn believed that some recent developments in the Empire required of them to relinquish some of their power and the planets their ancestors conquered, in the name of honor. This view was not shared by other Klingon lords.
After Torghn's death, caused by his own brother Qua'lon, the house was led by his son, Pok, son of Torghn. (ST novel: Klingon)