History of Portugal (1640–1777) put to the test in 1762 when Spain invaded aided by France, during the Seven Years' War. Britain invoked its alliance with Portugal and sent troops. Several months later, the conflict was settled with comparatively little fighting. In 1777, Spain and Portugal signed the Treaty of San Ildefonso, which mainly resolved a number of border disputes between their South American colonies. During the Age of Enlightenment, Portugal was considered one of Europe's unenlightened backwaters; it was a country of three million with 200,000 people in 538 monasteries in 1750. Melo seems to have been deeply embarrassed by Portugal's much lamented
CTT Correios de Portugal, S.A. CTT Correios de Portugal, S.A. Postal Services of Portugal, plc () is the national postal service of Portugal. The acronym CTT comes from the former name of this department (, meaning "Post, Telegraph and Telephone"), which was also the designation of postal services for the former Portuguese Colonies and still for the Macau Postal Service nowadays. CTT has become a public limited company in 1991, and in December 2013 the shares were listed on Euronext Lisbon. In 2007, CTT started to offer a mobile phone service in Portugal, under the brand name Phone-ix. CTT were privatised in 2014, in order