The Grand Tyrell Conspiracy
UPDATED: We don’t know if this was true, it seems unlikely with how Margaery was playing nice with the High Sparrow and secretly messaging the Queen of Thorns. Also the whole show of power at the Sept. But then again all this is moot due to the fact House Tyrell is gone as is the High Sparrow and the Faith Militant. The insanity with the High Sparrow is actually a long con played by the Tyrells.