similarity to the Chinese seal scripts. However, 古 gǔ had more than one meaning: besides meaning old, it could be used to refer to the Mongols (蒙古 Měng-gǔ). Records from Sejong's day played with this ambiguity, joking that "no one is more gu than the Meng-gu". That is, Gu Seal Script may have been a veiled reference to the Mongol Seal Script, or Phagspa alphabet. (Seal script is a style of writing, used for name seals and official stamps. Phagspa had a seal script variant modeled after the appearance of the Chinese seal script of its day. In this guise it was called the 蒙古篆字 Mongol Seal Script, with only the initial character distinguishing it from the 古篆字 credited by the Hunmin Jeong-eum as the source of hangul.) There were many Phagspa manuscripts in the Korean palace library, and several of Sejong's ministers knew the script well. If this were the case, Sejong's evasion on the Mongol connection can be understood in light of Korea's relationship with China after the fall of the Yuan dynasty, as well as the Korean literati's contempt for the Mongols as "barbarians". Indeed, such China-centered resistance kept hangul out of common use until the dawn of the twentieth century. Although several of the basic concepts of hangul came from Indic phonology through the Phagspa script, such as the relationships among the homorganic consonants and, of course, the alphabetic principle itself, Chinese phonology also played a major role. Besides the grouping of letters into syllables, along the lines of Chinese characters, it was Chinese phonology, not Indic, that determined which five consonants were basic, and therefore to be retained from Phagspa. These were the tenuis (non-voiced, non-aspirated) plosives, g for ㄱ , d for ㄷ , and b for ㅂ , which were basic to Chinese theory, but which were voiced in the Indic languages and not considered basic; as well as the sibilant s for ㅈ and the liquid l for ㄹ . (Korean ㅈ was pronounced in the 15th century.) (It is somewhat problematic that hangul ㅈ [ts] has been derived from Phagspa s [s] rather than from dz [ts]. However, the shape of the Phagspa s may have been more conducive to deriving multiple hangul letters than Phagspa dz would have been. Such a shift could easily have happened if the entire Phagspa alphabet were first used as a template for the new