Blog

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

Galileo before the Holy Office, painting by Joseph-Nicolas Robert-Fleury, 1847

The Man Who Made the Pope a Simpleton

Jun 22, 2026By Andy Barca

On 22 June 1633, Galileo Galilei knelt before the Holy Office and recanted heliocentrism. The standard science-vs-religion myth is not wrong, but it misses the smaller, more human story: a scientist who could not resist mocking his most powerful protector.

George Jones painting of the Battle of Vitoria, 21 June 1813

What Joseph Left Behind

Jun 21, 2026By Andy Barca

On 21 June 1813, Wellington encircled Joseph Bonaparte near Vitoria and drove the French from Spain in a single afternoon. The road north was covered in abandoned guns, gold, and paintings. A six-year occupation ended in a rout.

Engraving of the slave market in Algiers, Barbary corsair port

No One Came for Baltimore

Jun 20, 2026By Andy Barca

On 20 June 1631, Barbary corsairs landed at Baltimore, County Cork, and took 107 sleeping villagers into slavery. The English king was busy negotiating a trade deal with Morocco. The captives spent the rest of their lives in North Africa.

Édouard Manet, The Execution of Emperor Maximilian, 1867–1868

The Man Who Wouldn't Go Home

Jun 19, 2026By Andy Barca

On 19 June 1867, Maximilian I of Mexico was executed by firing squad on the Hill of the Bells outside Querétaro. Napoleon III had put him there. Juárez had a point to make. Maximilian had refused every chance to leave.

Medallion portrait of Ali ibn Abi Talib, Hagia Sophia, Istanbul

The Fourth Caliph

Jun 18, 2026By Andy Barca

On 18th June 656, Ali ibn Abi Talib finally became caliph - the post he had arguably been born for, after watching three others take it before him. He inherited a throne built on his predecessor's corpse. The First Fitna followed within months.

Painting of Vlad the Impaler's night attack on Mehmed II's camp at Târgoviște, 1462

Son of the Dragon

Jun 17, 2026By Andy Barca

On 17 June 1462, Vlad the Impaler led his cavalry into the sleeping camp of Mehmed II and nearly killed him. The real Dracula — the man who impaled 20,000 Turks outside his own capital — was considerably more dangerous than the fictional one.

Illustration of the coronation of Yazdegerd III, last Sasanian Shah of Persia

The Boy at Istakhr

Jun 16, 2026By Andy Barca

On 16 June 632, an eight-year-old boy was crowned Shah of Persia at the sacred temple of Anahita. He was the last Sasanian King of Kings. The empire he inherited had already been hollowed out by civil war, plague, and twenty years of war with Byzantium - and within weeks, Muhammad would die in Arabia.

Magna Carta, 1215, British Library Cotton MS Augustus II.106

The Peace That Started a War

Jun 15, 2026By Andy Barca

On 15 June 1215, King John applied his seal to Magna Carta at Runnymede, ending a baronial revolt. Within three months he had appealed to the Pope to annul it, the Pope obliged, and England was at war again. The document that supposedly founded Western liberty lasted as a peace treaty for less than a season.

Babbage Difference Engine No. 2, Science Museum, London

The Error in Every Column

Jun 14, 2026By Andy Barca

On 14 June 1822, Charles Babbage told the Royal Astronomical Society he could build a machine to calculate mathematical tables without human error. He was right about the problem and right about the solution. He never finished building it.

V-1 flying bomb on a launch ramp before takeoff, 1944

When the Engine Stopped

Jun 13, 2026By Andy Barca

On 13 June 1944, Germany launched eleven V-1 flying bombs at England. Four arrived. Six people died. Over the next eleven months, roughly 10,000 more followed - and the world's first cruise missile campaign killed more than 6,000 Britons and pushed 1.5 million out of London.