Cadeon Powell

Cadeon S. Powell, more commonly known by his title, The Grand Priest, was a human leader within the religious order known as the Silence. He referred to himself as Madame Kovarian's successor. Most people had no idea of his connection to the Silence, and he was primarily known as a loud-mouthed televangelist and the senior minister of the London National Assembly of God (which was actually a front for the Silence.) Some of the Silents referred to him as a "Prophet", which he has claimed to be.

Powell constantly claimed that "God" spoke to him, informing him that the End of Days was coming, and that the Messiah and Antichrist would appear and war would erupt on Earth, and God would return to create his kingdom on Earth.

In reality, the "God" who spoke to Powell was actually Omega, an ancient Time Lord who was manipulating Powell and the Silence to initiate his plan for revenge against the Doctor and the Universe in general.