The Scourging Souls and Breath Takers chapters.
The Scourging Souls are a Third Founding of the Dark Angels Chapter. They Stationed their Fortress Monastary on the primary moon Percion IV, recruting new marines from the tribes of the grassy plains of the planet.
Being a Dark Angels successor chapter they shared the mistrust and paranoid feelings toward the Inquisition. Because of this many were stunned when the Scourging Souls put up no protest when they were ordered to further divide their chapter. Not only did they not protest, they offered to completely fund the opperation. They supplied all manpower and materials needed to establish a new chapter.
Their only demand was that they would be able to choose the location of the new chapter. Seizing on this opportunity, everyone involved quickly signed off on the paperwork. Then the Scouging Souls reveled their plan. The new Chapter would be postioned on their home planet's second moon, often within eyesight of the chapter. They had given into the letter of the Inquisition's decree without acutally following its intent. The Breath Takers were born.
The two Chapters shared many of the same rituals, and even trained their troops along side one another.