The Scattering Edit
The group's emergence saw them come into direct contact with the Bene Gesserit, one of the groups, including the Fish Speakers, from whom they had evolved in the turmoil of the Scattering. They came with formidable military forces which they had built up in the previous thousand years, and overpowered numerous worlds weakened by the erosion of many established political players. One such world was the planet Junction, which the Honored Matres captured from the Spacing Guild.
After subjugating both the Spacing Guild and the Bene Tleilax, the Honored Matres embarked on an aggressive campaign to destroy, and before doing so, learn the knowledge of the Bene Gesserit. However, their plans of destruction failed, and the two groups effectively merged under the leadership of Murbella, as Mother Commander of both organizations. This outcome effectively marked the end of the Honored Matres' return to the known universe.