In the final decade of the eighteenth century, a group of colonial subjects in the captaincy of Minas Gerais began to imagine a Brazil free from Portuguese rule. They met in the homes of poets and priests, debated the ideas of Enlightenment philosophers, and drew inspiration from a revolution that had just transformed thirteen British colonies into an independent republic on the same continent. Their movement, known as the Inconfidência Mineira — roughly, the Minas Gerais Conspiracy — never became a rebellion. It was discovered, crushed, and its leaders were punished before a single shot could be fired. Yet it became one of the defining moments in Brazilian political memory, a rehearsal for independence that arrived three decades too early.
The movement grew from a specific economic crisis. Gold had been the engine of the captaincy's wealth and Portugal's colonial revenue for much of the eighteenth century, but by the 1780s the mines were exhausting their deposits. As production fell, the captaincy struggled to meet its tax obligations to the crown. The primary levy on gold was set at one-fifth of all production — the quinto — but the Portuguese administration had also begun demanding the payment of accumulated arrears. The mechanism for collecting this debt was called the derrama: a forced extraction of all unpaid taxes from the population, conducted by royal officials who could enter homes and seize property. For the indebted elite of Minas Gerais, many of whom had borrowed heavily to sustain their operations during the decline of mining, the prospect of the derrama arriving was existential.
The conspirators who gathered around this crisis were an unlikely coalition. Many had studied at the University of Coimbra in Portugal and returned to the colony carrying the ideas of Rousseau, Voltaire, and the French Enlightenment alongside their degrees. Among them were Cláudio Manuel da Costa, a celebrated poet who served as a colonial official; Tomás Antônio Gonzaga, born in 1744, also a poet and magistrate; and Alvarenga Peixoto, a prominent businessman and occasional versifier. The military side of the conspiracy was anchored by Lieutenant Colonel Francisco de Paula Freire de Andrade, born in 1756, who commanded the regiment of dragoons. José Álvares Maciel, a philosophy and chemistry student who had spent time in England, contributed technical and scientific thinking. The most visible figure, however — the one who most actively recruited and agitated — was Joaquim José da Silva Xavier, better known by his nickname Tiradentes, who served as an alferes in Andrade's regiment.
The conspirators' plans were ambitious but incomplete. They intended to rise up in armed rebellion on the very day the derrama was to be officially imposed — using the moment of greatest popular resentment as the spark for revolution. Their envisioned republic would have its capital at São João del Rei, with the city of Ouro Preto — then called Vila Rica — designated as a university town. Democratic elections would choose the republic's leadership, a radical idea for its time and place. Yet on many crucial questions the conspirators were deeply divided. Some were committed republicans; others were content with a form of monarchy. Some favored the abolition of slavery, recognizing the contradiction between their liberty-centered rhetoric and the enslaved labor that supported their households. Others considered abolition economically impractical and wanted to preserve the existing social structure, including the right to own property — and people. On still other questions, such as how to organize a citizens' militia or whether to develop cotton and iron production as alternatives to gold, there was tentative agreement but no detailed strategy.
The weakness of the plot lay precisely in this lack of coherence. There was no single commander, no unified program, and no popular base beyond the colonial upper class and its associates. The conspiracy attracted military officers, priests, and intellectuals but did not reach deep into the enslaved or free poor populations who bore the heaviest burden of colonial rule.
The plan collapsed from within. Three members of the movement informed on their colleagues to colonial authorities. The most consequential informant was Joaquim Silvério dos Reis, born in 1756, who had accumulated substantial debts to the colonial treasury and betrayed the conspiracy in exchange for relief from his obligations. Once the government was alerted, the arrests came swiftly. The conspirators were taken in 1789 and subjected to judicial proceedings that stretched for three years, concluding in 1792.
Queen Maria I of Portugal reviewed the sentences. Most of the condemned — including the poet Gonzaga, the lawyer Peixoto, the priest José da Silva de Oliveira Rolim, and others — had their death sentences commuted to perpetual banishment, typically to Angola or other Portuguese African colonies. Peixoto was exiled to the city of Ambaca in Portuguese Angola, where he remained for the rest of his life. Seven more conspirators received sentences of perpetual banishment without first being condemned to death. Only those whose crimes were deemed most serious faced the gallows, and of that group, all but one also received commuted sentences at the last moment. The exception was Tiradentes. He alone was hanged and quartered, his body publicly displayed as a warning.
The ideas the conspirators championed did not die with them. The Inconfidência Mineira became a touchstone for subsequent Brazilian political movements, its failures studied as carefully as its aspirations. When Brazil finally achieved independence in 1822, and more so when the republic was proclaimed in 1889, the memory of the 1789 conspiracy was deliberately woven into the new nation's founding narrative. The date of Tiradentes's execution was declared a national holiday. His image was elevated to that of a Christ-like martyr. The poets who had conspired alongside him — particularly Gonzaga, whose love poems to "Marília" had been written during his imprisonment — became central figures in the Brazilian literary canon.
