This article or section refers to elements from Expanded Dune.
The Grand Palais was the armorplaz palace of House Vernius in Vernii, below Ix. Earl Dominic Vernius administrated from his Orb Office.
Leto Atreides I was a guest there during his studies on the planet.
During the suboid revolt and the Tleilaxu invasion, the Grand Palais was deserted and then occupied by the Tleilaxu