5 October 1910 revolution — October 1910 coup d'état in Portugal; monarchy overthrown, republic established
The 1910 coup ended centuries of Portuguese monarchy and established the First Republic, reshaping the country's political and religious order.
Key Facts
- Date of Republic proclaimed
- 5 October 1910, at 9 a.m.
- Rebel soldiers and sailors
- Nearly 2,000
- Uprising began
- 3–4 October 1910
- Provisional government leader
- Teófilo Braga
- Constitution approved
- 1911
- Organizing party
- Portuguese Republican Party
By the Numbers
Location
Cause → Event → Consequence
By 1910, Portugal's monarchy faced deep crisis stemming from national humiliation over the 1890 British Ultimatum, resentment of royal expenditures, the 1908 assassination of King Carlos I and his heir, political instability between the Progressive and Regenerator parties, and João Franco's dictatorship. The Republican Party exploited this discontent, positioning itself as the sole force capable of modernizing Portugal.
On 3 and 4 October 1910, nearly two thousand soldiers and sailors rebelled. Facing little resistance from a reluctant military, republican forces prevailed rapidly. On the morning of 5 October, the Republic was formally proclaimed from the balcony of Lisbon's City Hall, ending the centuries-old Portuguese monarchy and installing a provisional government under Teófilo Braga.
A provisional government led by Teófilo Braga governed until the Constitution of 1911 formally inaugurated the First Portuguese Republic. The national anthem and flag were replaced, and civil and religious liberties were introduced. However, a wave of aggressive anti-clericalism followed, severely straining relations between the new Republic and the Catholic Church.
Economic Impact
The overthrow of the monarchy and establishment of the First Republic introduced political instability and anti-clerical reforms that disrupted existing institutional and economic structures in Portugal.