The Julian calendar proposed by Julius Caesar took effect on 1 January 45BC when the place we now know as Portugal was under the control of the Roman Republic.
On 10 January four years earlier, Julius Caesar had famously crossed the Rubicon and declared Alea iacta est (The die has been cast!). This resulted in the Great Roman Civil War, a politico-military struggle fought over a wide area, including the provinces of Hispania, as the Iberian Peninsula was then called.
On 16 January 27BC, Augustus became emperor of the Roman Republic and went on to establish the Roman Empire. The complete Romanisation of Portugal took place over centuries and left a profound administrative and cultural legacy that remains to the present day.
Various armies and cultures came and went in Portugal and Spain after the downfall of the Romans. The most influential and longest-lasting were the Moors, Muslims from North Africa, who overwhelmed the Germanic, so-called “barbarian”, Visigoths in 711.
A major turning point in the centuries of Moorish occupation in central Portugal started on 20 January 1064 when Ferdinand I of León-Castile began besieging the Muslim city of Coimbra. The Moorish governor surrendered and was allowed to leave with his family, but 5,000 inhabitants were taken captive and deported.
Seven hundred years of Moorish rule in the Iberian Peninsula ended on 2 January 1492 when Queen Isabel of Castile and King Ferdinand of Aragon finally conquered Granada, the last Muslim stronghold in Spain.
Having set out from Lisbon with four ships in mid-1497 to find a sea route to the East Indies, the Portuguese explorer Vasco da Gama reached the mouth of the Zambezi River in January the following year, before eventually sailing around Africa's Cape of Good Hope to become the first European to open a sea passage to India.
Portuguese explorers landed at Guanabara Bay on the coast of South America on 1 January 1502 and named it Rio de Janeiro (River of January), now Brazil’s second largest city.
The Julian calendar had always miscalculated the length of the solar year by 11 minutes and so it had fallen out of sync with the seasons. Because of this, the Roman Emperor's system was replaced in 1562 by the Gregorian calendar. Named after Pope Gregory XIII, who was born in January 1502, this calendar is still the most commonly used in the world today.
Catholicism, along with the Catholic monarchs, was in full control in Portugal throughout the Middle Ages and into modern times.
Frequently there were serious disputes and friction at the top. For example, on 13 January 1759, the nobleman Dom Francisco Távora and his entire family were publicly executed in a field near Lisbon for allegedly trying to murder King Dom José I. The king and his court were on hand to watch the executions, even though the accusation of high treason had not been proven. It was thought to have been a political and economic conspiracy against the Távora family fabricated by the king’s right-hand man, the Marquis of Pombal.
New Year’s Eve 1908 was the penultimate day in the life of the penultimate king of Portugal. Revolutionary gunmen assassinated 44-year-old Carlos I and his eldest son, Luis Filipe, as they rode in an open carriage through the streets of Lisbon.
A republican revolution forced Carlos’s younger son and heir, Manuel, to abdicate. Manuel and his mother fled to London via Gibraltar. They settled at Abercorn House in Richmond early in 1911. After marrying the German Princess Victoria Augusta of Hohenzollern in 1913, Manuel and his family settled at Fulwell Park in Twickenham.
Republicans had their differences too, of course, and it was in the city of Beja north of the Algarve in the early hours of 1 January 1961 that an unsuccessful military attempt was made to topple the dictatorship of António de Oliveira Salazar. The revolution proper would have to wait another 13 years.
Under a democratically elected president, António Ramalho Eanes, rather than a monarch or dictator as head of state, Portugal joined the European Economic Community, forerunner of the European Union, on 1 January 1986.
Along with 10 other countries, Portugal began using the euro currency on 1 January 2002. The escudo disappeared fast, but unprecedented financial problems were soon to emerge.
Even the economist Aníbal Cavaco Silva, centre-right prime minister from 1985 to 1995, couldn’t have foreseen the severity of what lay ahead when he was elected president in January 2006. The downturn in the Portuguese economy that started in 2001 drastically worsened with the global credit crunch in 2008.
In early 2010 the Socialist government was preparing a package of austerity measures, including cuts in public spending and tax increases, to reduce Portugal’s budget deficit. The country soon reached a record high unemployment rate of nearly 11%, a figure not seen for more than two decades.
Amid the backdrop of hundreds of thousands of workers going on strike, the credit ratings agency Standard and Poor’s downgraded Portugal’s rating to junk status in January 2012.
By January 2015, former Socialist premier José Socrates was in custody on suspicion of corruption, tax fraud and money laundering.
By contrast, former Socialist prime minister António Guterres took office as United Nations Secretary-General to extraordinary acclaim on New Year’s Day 2017. One of the few things the most powerful leaders across the bitterly divided world agree upon was that Guterres was the best man for the herculean job of curbing warfare, deprivation and poverty.
Among the few things we can be fairly sure of in the Algarve in January 2019 are mid-winter maximum temperatures of 16º and minimums of 8º, with a good amount of rain to water the gardens and countryside.