He confined his teaching to an inner circle of courtiers, all of whom remarked on the beauty of his mellifluous voice. In curious contrast to the single mindedness with which he pressed his new belief system, he was frequently irresolute about the outside world and procrastinated constantly in his negotiations with foreign ambassadors.
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Sir Flinders Petrie, the first to understand Akhenaten’s historical importance, described him both as the first monotheist and the first individual in history and wrote "a man who was indisputably a genius and who managed to crush the thousand-year-old shell of habits, superstitions and conventions of society and courageously resisted the power of the clergy and other dignitaries".
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In the sixth year of his reign, he left Thebes and established a new capital which he called Akhctatcn, 'Horizon of the Disk'. He introduced a new art style and a new cult of the sun disk and changed his name from Amenhotep IV, which means 'Amun is satisfied', to 'Akhenaten', meaning 'It is well with Aten', and later or dered that the name Amun be chiseled out on every tomb, temple and monument on which it appeared throughout all of Egypt, even on his father's monuments. This heresy brought him and his successors down and brought down the 18th Dynasty after its magnificent start.