In addition to the Sakdina system, another of the numerous institutional innovations of Borommatrailokkanat was to adopt the position of uparaja, translated as "viceroy" or "prince", usually held by the king's senior son or full brother, in an attempt to regularise the succession to the throne—a particularly difficult feat for a polygamous dynasty. In practice, there was inherent conflict between king and uparaja and frequent disputed successions.[19] However, it is evident that the power of the Throne of Ayutthaya had its limit. The hegemony of the Ayutthaya king was always based on his charisma in terms of his age and supporters. Without supporters, bloody coups took place from time to time. The most powerful figures of the capital were always generals, or the Minister of Military Department, Kalahom. During the last century of Ayutthaya, the bloody fighting among princes and generals, aiming at the throne, plagued the court