Relations between the papacy and Philip II of Spain were difficult for several ideological and political reasons. Politically, Philip controlled territories in Italy that the Pope saw as under his domain. Philip also sought to control the Spanish church and interfere in papal elections. Ideologically, Philip tightly controlled the Spanish Inquisition and implementation of reforms, limiting papal authority. While they wanted to present a united front against heresy, tensions over foreign policy and Philip's dominance strained their relationship and weakened the Catholic Church's overall effectiveness against the spread of Protestantism.