House Moritani: the Feuding House of Grumman in Dune

House Moritani is the Great House that ruled Grumman, the second planet of Niushe. Frank Herbert gives it a single line of history: it fought a War of Assassins against House Ginaz, allies of Duke Leto Atreides, and won. The later books by Brian Herbert and Kevin J. Anderson make it the sworn enemy of House Ecaz and give it a ruler, Viscount Hundro Moritani, whose grief and rage destroyed the House. (Dune (appendix); Expanded books: Paul of Dune)

What Frank Herbert says about House Moritani#

Very little, and all of it is about war. The Terminology of the Imperium printed with Dune describes Grumman as the second planet of Niushe, noted chiefly for the feud of its ruling House, Moritani, with House Ginaz. Its entry for House Ginaz says the Ginaz were one-time allies of Duke Leto Atreides and were defeated in the War of Assassins with Grumman. (Dune (appendix))

In the story itself the House appears through Duncan Idaho, who says his sword was first blooded on Grumman. Frank Herbert doesn't explain it, but since Duncan was a Swordmaster of the Ginaz and the Atreides were Ginaz allies, he most likely fought on the Ginaz side. (Dune)

That is the whole of House Moritani in the original novels: a feuding House that used the Great Convention's rules on limited war to break a rival. Frank Herbert never names a Moritani ruler. (Dune; Dune (appendix))

Viscount Hundro and the first war with Ecaz#

The expanded books give the House a face. Its head is Viscount Hundro Moritani, and his great enemy is Archduke Armand Ecaz. The two Houses had been feuding for generations. In their first War of Assassins, Moritani forces bombarded the Archducal Palace on Ecaz, and Armand's heir Sanya was kidnapped and publicly executed on Grumman. (Expanded books: Dune: House Harkonnen; Dune: House Corrino)

The Viscount's methods cost him the Swordmasters. The council on Ginaz ordered every Moritani student to give up his House or leave the school, and Moritani raiders later struck the school on Ginaz itself. Only one Grumman student, Hiih Resser, chose to stay, and he later went home and became the Viscount's personal Swordmaster. (Expanded books: Dune: House Harkonnen; Paul of Dune)

A dead son and a ruined wedding#

What turned the feud into a war of annihilation was Hundro's son. Wolfram Moritani, his only child and heir, fell ill with a wasting disease. The one treatment grew only on Ecaz, and Armand Ecaz had banned it from leaving his world, Grumman above all. The boy died early in 10187 AG, and his father went half mad with grief. (Expanded books: Paul of Dune)

That same year Armand offered his last daughter, Ilesa, to Duke Leto Atreides. Hundro struck at the wedding at Castle Caladan. Blades hidden in the hall's potted plants, supplied by Prad Vidal, a traitorous Ecazi vassal, killed Ilesa and cost Armand an arm. A recorded message from the Viscount claimed the attack. House Atreides was now in the war too, and House Harkonnen backed Hundro in secret. (Expanded books: Paul of Dune)

The end of House Moritani#

In the War of Assassins of 10187 AG the Atreides and Ecazi armies besieged Ritka, the Moritani capital on the edge of a salt basin, after Leto had killed Vidal under the forms of kanly. Hundro's cavalry, mounted on Grumman's huge wild stallions, hurt the besiegers but couldn't break them, and Rhombur Vernius arrived from Ix with more troops. (Expanded books: Paul of Dune)

With nothing left, Hundro claimed to be the last heir of House Tantor, a renegade family blamed for the atomic ruin of Salusa Secundus, and ordered the atomics buried around Ritka set off while the Emperor and the assembled nobles stood on top of them. Nothing happened. Hiih Resser had laid the weapons but never fitted the detonators. Emperor Shaddam IV stepped in to stop the war and had the Viscount arrested, and Hundro died in a depressurisation accident in space before he reached prison. (Expanded books: Paul of Dune)

House Moritani collapsed completely. Its fiefs and wealth went to House Ecaz, so Armand ended the war as master of his enemy's world. For how this fits beside the other noble families, see the Great Houses of Dune and the Landsraad. (Expanded books: Paul of Dune)

House Moritani in Dune: Awakening#

Dune: Awakening (2025) includes House Moritani among the 25 Houses of its Landsraad. Like the other Houses, it can be backed by players for rewards. Awakening is set in an alternate history, so its Moritani don't follow the expanded books' timeline. (Dune: Awakening)