The Grand Alliance is a coalition of Nations part of the Tenth Crusade. With First Prince of Procer Cordelia Hasenbach as the original driving diplomatic force behind it, the underlying intention was for the diplomatic bonds tied to last beyond the Crusade.
Book 4-5[]
The original nations in the Grand Alliance consisted of the Principate of Procer, the Dominion of Levant and the Thalassocracy of Ashur.
At the end of the botched invasion of Callow, Catherine Foundling blows a political bomb by petitioning for Callow to be part of the Grand Alliance, which would make war against the Nation politically impossible, while at the same time throw Callow into war against The Empire of Praes.
Book 5-6[]
After the Salian Peace Conference, the new members of the Grand Alliance are the Principate of Procer, the Dominion of Levant and the Kingdom of Callow.
The main goal for the Grand Alliance has switched to defeat the Dead King, with Keter's ally Dread Empress Malicia being occupied by civil war in Praes.