Charles III was the King of Spain and the Spanish Indies from 1759 to 1788. He reigned over an empire in decline. He tried to arrest this decline by a programme of modernisation promoting trade and science. Described as an reign of 'enlightened absolutism' - curiously not seen as an oxymoron by many historians, he saw the weakening of the church and particularly the monasteries as part of this modernisation. This program included a growth in hostility towards the Jesuits - and in that curious short-sightedness of 'Enlightenment Rulers' the suppression of the Society lead to the dismantling of the most effective education network in the Spanish Empire. With an undoubted passion to promote science, it seems that his hatred of the Jesuits trumped this and many science teachers were exiled.
The Papacy was also seen as a threat to his absolutism - and thus his ability to effect much needed reform. He allowed no papal briefs in Spain without royal permission. His desire was to subjugate the papacy to the crown. The Jesuits loyalty to the Pope only increased his hostility to them. Their international presence made him particularly paranoid about their loyalty to the Spanish Crown particularly in mission territories, specifically the American colonies. This meant that he was susceptible to the hostile propaganda about the Jesuits in the Spanish Court, wishing to believe the worst e.g. that they formented the riots in Madrid in 1766 that spread around the country
There are many contradictions in the personality of Charles III, despite his desire to weaken the Church, he remained a sincere and faithful Roman Catholic. A progressive home policy included the cancelling of a tax on flour to stimulate trade, promoting free speech, a strong press and encouraging the holding of private property. This domestic policy was undermined by a disastrous foreign policy. An ill advised invasion of Portugal led to a war which resulted in the taking of Gibraltar by the superior navy of Britain and the temporary loss of Havana and Manila to the British. This later two colonies were returned to Spain only after the transfer of Florida to Britain.