Great Convention
The treaty binding the Great Houses, the Spacing Guild and the Imperium, which bars atomics against human targets and fixes the lawful forms of feud.
Shortly after the destruction of the thinking machines, the Great Houses, the Spacing Guild and the Imperium struck the treaty that is the reason the Imperium has rules about how its members may fight one another. The Great Convention bars atomics against human targets, outlaws thinking machines, and sets out the permitted forms of feud, which are kanly and the War of Assassins. Every article of it opens with the same words: the forms must be obeyed. The premise underneath is that human life is precious above any other kind of existence, and that the rules exist to protect it.
How far into Dune have you read?
Set your place and this page rewrites itself to exactly that point. Nothing ahead of you will show.