The 15th century was a crucial period in the establishment of the governing system and regimental foundation of the [oseon Dynasty. Begun under King Sejong (1418-1450) and finalized in 1474, the Confucian-derived five cardinal principles of conduct were codified in the Oryeui (The Five Rites of State), considered to be the foundation of the Dynasty's sovereignty and royalty. The compilation of the Gyeongguk Daejeon (The National Code) was initiated during the reign of King Sejo (1455-1468), to establish the administrative framework of the Joseon government.*br* Official records during the Joseon Dynasty adhered to the tradition of faithful transcription of daily events in minute detail. These records render it possible to gauge the inception, growth, and establishment processes of white porcelain in the Joseon Dynasty and their social and cultural background,*br* Apparently, the production of white porcelain in the Gwangju area began around 1420 at the same kilns where punchong ware was still produced, although white porcelain may have been processed in individual encasements. Such conjecture derives from the records contained in the Gwangju section of the Sejong Sillok Jiriji, or the Geographical Description of the Eight Provinces, included in the Annals of King Sejong (1432).*br* From the 14305 to 14405, white porcelain experienced further growth while punchong ware gradually disappeared. During the 1450s to 1460s, the development of white porcelain flourished. It was during this period that blue-and-white porcelain also appeared. Such blossoming was prompted by the keen interest shown by King Sejo. as evidenced by the numerous records contained in the Annals of King Sejo (1455-1468). Most notably, with the establishment of official kilns in 1469, systematic production of white porcelain began in Gwangju, Gyeonggi-do Province, under the control of Saongwon, or the Bureau of the Palace Kitchen Management, heralding the sao-year history of white porcelain of the Joseon Dynasty.