"Farad'n?!" Alia was openly surprised, "Why would you marry into house Corrino? That just seems absurd! He's nothing but a pawn to his mother..." As she thought on it, Alia wondered who made such a ridiculous decision. Had Feyd still lived, she would have preferred a Harkonnen treaty, to a Corinno one.
And then it hit her.
There was most likely only one person who could have made such a decision.
Irulan.
The crafty whelp was alwaysplotting with the Bene Gesserit. Was it not the princess who had fed Chani contraceptives? Was it not Irulan that hated Alia most?