The term Subak (also spelled Soobak, or Soo Bahk) can have several meanings: * Some authors use the term subak as a synonym for taekyon, considering the two to be identical. * Author authors refer to to taekyon as being just one style of subak. * Still others refer to subak as a Silla-specific derivative of taekyon. The Mongul invasion of Korea in 1231 C.E. destroyed most written records up until that time (including any written records that might have pertained to martial arts), so it is very possible that historians will never be able to reconcile these ambiguities.