Blog

Blogs, essays, updates, and occasional notes that sit alongside The Butterfly Effect.

Statue of Doubravka of Bohemia, Mieszko I's Christian wife, whose marriage preceded his baptism in 966.

The Marriage and the State

Apr 14, 2026By Andy Barca

On 14 April 966, Mieszko I, pagan ruler of the Polans, converted to Christianity following his marriage to Doubravka of Bohemia. The baptism created Poland. What followed would be centuries of glory, tragedy, erasure, and resurrection.

Queue outside a bank in Kolkata during the 2016 withdrawal of India's Rs 500 and Rs 1,000 notes.

The Rupee Plot

Apr 14, 2026By Andy Barca

Two works of Indian fiction, separated by nearly two decades, share the same subplot: Pakistani intelligence counterfeiting Indian banknotes. The coincidence is worth examining - not for what it says about Pakistan, but for what it might say about India.

Royal coat of arms of the United Kingdom (1816–1837), the arms in use when the 1829 Relief Act received royal assent.

The Price of Emancipation

Apr 13, 2026By Andy Barca

On 13th April 1829, the Roman Catholic Relief Act received royal assent, allowing Catholics to sit in Parliament for the first time since the Penal Laws. It was a genuine victory. The terms on which it was extracted deserve closer inspection.

Portrait of Maharaja Ranjit Singh, Lucknow Company School, c. 1810–1820

Married Into an Empire

Apr 12, 2026By Andy Barca

On 12 April 1801, a one-eyed, unlettered twenty-year-old was crowned Maharaja of Punjab. He struck no coin in his own name and built his empire as much through marriage as through the sword.

Nineteenth-century painting of Crusaders conquering Constantinople in 1204 during the Fourth Crusade.

The Wrong City

Apr 12, 2026By Andy Barca

On 12 April 1204, Crusaders breached the walls of Constantinople. They had set out to free Jerusalem. They ended up sacking the greatest Christian city in the world - and dismantling the one barrier standing between Europe and the Ottoman advance.

Painting of William of Orange and his Dutch army landing at Brixham, Devon, November 1688.

A Crown by Invitation

Apr 11, 2026By Andy Barca

On 11 April 1689, William III and Mary II were crowned as joint sovereigns of Britain. The Glorious Revolution that put them there is one of history's rarest things: a constitutional order that reformed itself without first destroying itself.

Diagram of the scale of the 10 April 1815 eruption column of Mount Tambora, Sumbawa.

The Mountain That Ate Summer

Apr 10, 2026By Andy Barca

On 10 April 1815, Mount Tambora erupted with enough force to be heard in Sumatra. 71,000 people died. The following year, summer failed across three continents. It was the geological equivalent of a warning shot - and we have largely ignored it.

Vicente Mostre's painting of the Morisco expulsion at the port of Denia, following Philip III's 1609 decree.

The Last Muslims of Spain

Apr 9, 2026By Andy Barca

On 9 April 1609, Philip III signed the decree expelling the Moriscos from Spain - the descendants of Muslims whose families had lived on the Iberian peninsula since 711. The Treaty of Granada had promised them peace. It took 117 years to break that promise.

Punch cartoon 'Entente Cordiale' (1904) showing Britain and France dancing together after the agreement.

A Thousand Years of Bad Blood

Apr 8, 2026By Andy Barca

On 8 April 1904, Britain and France signed the Entente Cordiale, ending nearly a millennium of rivalry with a series of colonial bargains. The agreement did not just settle old disputes — it eventually helped ignite a world war.

Title page of a 1583 printed edition of the Corpus Iuris Civilis (Dionísio Godofredo).

The Law That Outlasted the Empire

Apr 7, 2026By Andy Barca

On 7 April 529, Justinian I published the first instalment of the Corpus Juris Civilis - a codification of Roman law that outlasted the empire, shaped the medieval church, and provided the blueprint for the Napoleonic Code. It is still in use.