The House of Mogh was a family of high social and political rank and one of the Great Houses in the Klingon Empire until 2366 when false documents were produced which showed that Mogh had betrayed the Empire to the Romulans in the Khitomer Massacre of 2346. (TNG: "Sins of the Father")
After this second discommendation, Kurn, who had been a member of the High Council, was close to suicide. His brother Worf instead had his memory wiped and asked a family friend, Noggra to take him into his house as a son. (DS9: "Sons of Mogh")
Worf wore the emblem of the House of Mogh, until being accepted into the House of Martok, as a sign of remembrance of his past. Jadzia Dax thought it was a sentimental gesture on Worf's part. (DS9: "Soldiers of the Empire")
|Klingon Great Houses|
|Antaak • D'Ghor • Duras • Grilka • Konjah • Kor • Korath • Martok • Mo'Kai • Mogh • Noggra|
Klingon houses are normally renamed after their new head following the death of a former leader. (DS9: "The House of Quark") Unlike the norm, however, the House of Mogh is not named after its head; the house retained the name "House of Mogh" even after Mogh's death, instead of being renamed the "House of Worf." The reason for this has never been explained; this could be a choice by Worf, or perhaps because, at the time of Mogh's death, Worf was only a child and not yet able to lead a Klingon house. In "Sins of the Father", K'mpec admits that they never expected Worf to return to the Empire after building a life for himself in the Federation, and so the "House of Mogh" could have been left as an unclaimed legal shell for which blame for the Khitomer Massacre could be attached.
Ronald D. Moore stated, "We've never explored the hows and whys regarding the naming of Klingon Houses. The House of Mogh reference was probably something that Worf carried on out of respect for his deceased father. This might be the right of a son – to perpetuate a single name for the House instead of supplanting it with his own." (AOL chat, 1997)