Portugal historical timeline

Portugal has one of the oldest and least-changed borders in Europe, which makes its history unusually legible: the country a visitor travels through has had roughly this shape for eight centuries. What changed instead was the capital, twice -- once by earthquake and once by revolution -- and those two events explain most of what Lisbon physically is and why the country opened to visitors as recently as it did.

Chronology

1. 1143 Afonso Henriques and Alfonso VII meet at Zamora on 4 and 5 October. The question of independence was not definitively settled, but the separation of Portugal was, in the phrase used of it, an accomplished fact -- and the border agreed then is substantially the border a traveller crosses today.
2. 1147 The siege of Lisbon runs from 1 July to 25 October and brings the city under the definitive control of the new Kingdom of Portugal -- one of the few Christian victories of the Second Crusade. The castle on the hill and the cathedral below it date from the reordering that followed, and the Alfama street plan beneath them is what the siege did not destroy.
3. 1494 The Treaty of Tordesillas is signed on 7 June, dividing the newly encountered world between Portugal and Castile along a line in the Atlantic; the Pope ratified it in 1506. It is the single reason Brazil speaks Portuguese and the rest of South America speaks Spanish, and therefore the reason a Portuguese speaker can travel half the Atlantic world.
4. 1498 Vasco da Gama lands at Kozhikode on 20 May, completing the sea route from Europe to India. Everything monumental at Belém -- the monastery, the tower, the tombs -- exists to commemorate this voyage, and the wealth it opened paid for the Manueline architecture that is Portugal's one wholly original style.
5. 1501 Construction of the Jerónimos Monastery begins on 6 January and is completed a hundred years later. It holds the tombs of Manuel I, John III and Vasco da Gama, and of the poet Camões, who wrote the voyage into an epic in 1572 -- the closest thing Portugal has to a national shrine.
6. 1755 The earthquake strikes on the morning of 1 November, All Saints' Day, and the fire and tsunami follow. It is the single most consequential date for anyone walking around Lisbon: the grid of the Baixa, the uniform facades and the wide squares are all the rebuilding, and the ruined Carmo Convent was deliberately left standing as a reminder of the destruction.
7. 1910 The revolution of 5 October overthrows the centuries-old Portuguese monarchy and replaces it with the First Republic, after a crisis that included the assassination of the king. The palaces a visitor tours became museums at this point rather than residences, which is why so many are intact and open.
8. 1933 The Estado Novo is established under Salazar, whose power rested on a presidency reduced to a figurehead and a legislature restricted to a single party. It lasted until 1974, and a visitor meets it in the monumental public works, the bridges and stadiums, and the deliberate absence of the political history from older signage.
9. 1961 The Portuguese Colonial War begins in Africa and runs for thirteen years. It is the pressure that produced the Carnation Revolution: the war ended with the coup of April 1974, and the former territories became sovereign states immediately afterwards.
10. 1974 The Carnation Revolution overthrows the Estado Novo regime on 25 April. It ended four decades of dictatorship and the colonial wars with it, and it is why Portugal's tourism, infrastructure and international openness date from the late twentieth century rather than the mid.
11. 1983 The Jerónimos Monastery is classified a UNESCO World Heritage Site along with the nearby Tower of Belém. The joint listing is why the two are visited as one outing and funded as one site, and it is the moment Portugal's Age of Discovery monuments were formally recognised as a set.
12. 1986 Portugal enters the European Economic Community, leaving the European Free Trade Association it had helped found in 1960. Accession funded the motorways, the airports and the rail upgrades a visitor now uses, and it is the reason the country's infrastructure is markedly better than its prices suggest.
13. 1998 Expo '98 runs in Lisbon from 22 May to 30 September on the theme "The Oceans, a Heritage for the Future", chosen partly to mark 500 years of Portuguese discoveries, and draws over 10 million visitors in 132 days. The site reopened on 15 October as the Parque das Nações, keeping the Oceanarium -- then Europe's largest aquarium -- the observation tower and the gardens, which is how a derelict industrial waterfront became a district visitors go to.

What survived, and what did not

Lisbon is two cities and the seam is visible from any hill. Below, the Baixa is one planned rebuild -- the Pombaline lower town, laid out on a grid after 1755 and now one of the city's best-known quarters. Above and around it, Alfama and the older hills survived because the geology under them held, which is why the medieval street plan exists there and nowhere in the centre. The Carmo Convent is the deliberate exception: its ruins were preserved rather than cleared, and standing in the roofless nave is the most direct encounter with 1755 available.

Outside the capital the pattern reverses. Porto, Guimarães, Évora, Coimbra and the Douro villages were not levelled and were not rich enough to redevelop, so their fabric is continuous in a way Lisbon's is not -- three of them are UNESCO-listed on exactly that basis. The other great survival is the tile. Azulejo facades are not decoration applied to old buildings; they were a weatherproofing and cooling technology, which is why they are still on working houses rather than confined to monuments.