A survey of the Spanish colonial system or a study of the government of any one colony will reveal the fact that political life and power there were vested chiefly in three institutions. Upon these the peace, prosperity and security of each colony largely depended. These institutions were the audiencia, the office of viceroy, or captain-general, and the church. By means of the two former the royal interests in the colony were represented, and through the latter one of the chief aims of Spain's colonial system was effected, namely, the conversion of infidels and the subsequent care of their souls. The church added to its own power in various ways. No study of Spanish colonial institutions would be complete which failed to consider the church as a political power. It is to a consideration of these three chief factors of colonial government, and their interrelation, that this study will be dedicated. After a review of the circumstances surrounding the establishment of the Audiencia of Manila, we shall devote ourselves to a detailed study of the audiencia itself. We shall first notice the audiencia's judicial functions as a court of ordinary justice and secondarily as a court of residencia. The second part of this section will be concerned with the semi-judicial and administrative functions of the audiencia. The title of captain-general was primarily of military significance, and it was exercised alike by viceroys and governors; the official designation of the former being "my viceroy and captain-general" and that of the latter being "my governor and captain-general." Not all governors were captains-general. The viceroys in the larger divisions and the captains-general in the smaller ones represented the king as head of the church and state in their several districts. Because these officials were so powerful and their duties so multitudinous, they came into contact with every department of the government. The audiencias came into relation with these officials most frequently. It is therefore necessary to study the governor and captain-general first from the viewpoint of his position as chief executive of the colony and as representative of the king. The frequency of their relations and the identity of their spheres of authority suggest that we give attention to the conflicts of jurisdiction of the governor and audiencia; finally, we shall take note of the occasions on which the audiencia assumed the government on the event of a vacancy, noticing the laws authorizing such action and the principles underlying them.