I was reading the Dune Appendices and in Appendix II: Religions of Dune - SPACE TRAVEL Frank Herbert wrote:
The major dams against anarchy in these times were the embryo Guild, the
Bene Gesserit and the Landsraad, which continued its 2,000-year record of
meeting in spite of the severest obstacles.
This was immediately after the Butlerian Jihad. And then the Landsraad was already 2000 years old.
But in BH/KJA's Legends novels, there is no mention of the word Landsraad. Only the 'League of Nobles'.
In Dune Appendix II there IS one time the Landsraad is called the 'Landsraad League'. But why is the word Landsraad never used by anyone in the BH/KJA's jihad novels? Weird.