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The aim of this article is to review the process of plan changes from rectangular shapes to square, and the reasons for these changes through the Achaemenid dynasty. The innovation of using square plans in the second stage of Achaemenid architecture progressed with its developed style that fatherly left influence on domes construction in Parthian architecture. The ideology of “Darius The Great” and the impact of affiliated nations on his intellect were the reasons, for which the transformation of pre - Achaemenid rectangular to square plans was occurred. The cited phenomenon was studied to be the result of Greek’s cultural impression, regarding the use of numbers and figures in plans. Square plans stepped into Persian architecture as the perfect shapes with respect to Pythagorean philosophy and beliefs of some intellectuals, such as Plato. Square plans were, moreover, adapted to create a new style of architecture; since, they were the bases on which domes were constructed. 

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Greek historians such as Herodotus consider the beginning of Satrapies, the dependent governments within Achaemenian territory, as early as the time of Darius the first, while the word “Satrap” was prevalent in the time of Cyrus and Cambyses. Therefore, if we consider the beginning of Achaemenian empire in 559 BC, the year that Cyrus the second came to power, and its ending in 332 BC, the year that Iran was conquered by Alexander the Macedonian, in these 227 years of military and political development of Achaemenian empire, some of the nations and countries within Achaemenian territory came under Iranian military, economic and political power which known as Achaemenian settled Satrapies. According to reported Archeological findings in Egypt, Iran and other subordinate countries, the number of these satrapies was different at different times of Achaemenian empire. For example, the number of these Satrapies regarding Bistoon and Persepolis inscriptions is 23, while considering inscription on Darius tomb in Necropolis the number of Satrapies is 30 and regarding Darius inscription found in Susa it is 27. In the event that considering Egyptian written evidences at Achaemenian time such as Darius statue and memorial stone of Suez Canal, the number of satrapies was 24. By these findings, we can discover the location of these satrapies and determine their geographical area. The study based on historcal texts and new archaeological findings during the emergence of the ruling of the Achaemenid Empire in Anatolian land Satrapi, it is proven that 7 Satrapies existed in this area, includeing: Satrapi Lady or Sard North West Turkey, Satrapi Kylykyh in South West Turkey, Satrapi Ionie North West, Satrapi carie the West Anatolia, Satrapi Frygyh Hlspvnt the centrality Daskylyvn North West Asia Minor, Satrapi Skudrien (Makedonien) North West, and Cappadocia in East Anatolian.