T’aejo

By the reign of King Taejo (53–146 ce), a royal hereditary system had been established. With the promulgation by King Sosurim (reigned 371–384) of various laws and decrees aimed at centralizing royal authority, Goguryeo emerged as a full-fledged aristocratic state. Its territory was extended greatly during the reign of King…

…begun for Goguryeo by King Taejo (reigned 53–146 ce), for Baekje by King Koi (reigned 234–286), and for Silla by King Naemul (reigned 356–402).