Blog

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

Silver denier of Charlemagne minted at Mainz, 812–814, with imperial monogram.

The Father of Something

Apr 2, 2026 By Andy Barca

On 2nd April 747, Charlemagne was born. He would build an empire stretching from the Atlantic to the Elbe. His heirs would spend thirty years tearing it apart. The pieces became France and Germany.

Marble portrait of Emperor Diocletian, founder of Rome's diarchy.

One Man Was Not Enough

Apr 1, 2026 By Andy Barca

On 1st April 286, Diocletian appointed Maximian as co-Augustus, establishing Rome's first diarchy. The empire covered 5 million square kilometres. The logic was straightforward.

Ratification of the Japan–United States treaty (21 February 1855)

The Black Ships

Mar 31, 2026 By Andy Barca

On 31 March 1854, Commodore Matthew Perry forced the Tokugawa Shogunate to sign the Convention of Kanagawa, ending 220 years of Japanese isolation. The treaty was designed to keep Japan dependent. Japan had other ideas.

Dr. Crawford Williamson Long, photograph taken in 1877, the year before his death

The Man Who Killed the Scream

Mar 30, 2026 By Andy Barca

On 30 March 1842, a country doctor in Jefferson, Georgia, soaked a towel in sulphuric ether and held it under a young man's nose. James Venable felt nothing. Crawford Long had just changed surgery forever.

Map showing the stages of the Roman conquest of the Iberian Peninsula, from 218 BC to 19 BC

Carthage's Parting Gift

Mar 30, 2026 By Andy Barca

Rome had soldiers in Spain a century before Julius Caesar bothered with France, even though France was right next door. The reason has nothing to do with strategy and everything to do with Hannibal.

WWI soldiers in a trench

The Man Who Fought With a Chequebook

Mar 30, 2026 By Andy Barca

Edward Stettinius dropped out of school at sixteen, ground his way through a decade of failed ventures, and eventually ran the Diamond Match Company. Then the Allies hired J.P. Morgan to buy for the First World War, and Morgan hired him.

The Imperial Chinese Government 5% Hukuang Railways Gold Loan bond, issued 15 June 1911

The Consortium That Lost China

Mar 29, 2026 By Andy Barca

In 1911, a cartel of Western banks lent the dying Qing dynasty £6 million to nationalise China's railways and hand the proceeds to foreign creditors. The protests that followed toppled the empire. The bonds were still worthless in 1983.

1912 map of Northern India showing the centres of the Indian Rebellion of 1857

The Cartridge and the Crown

Mar 29, 2026 By Andy Barca

On 29 March 1857, Sepoy Mangal Pandey shot at his officers at Barrackpore and started no rebellion. Six weeks later India was on fire. The uprising that followed ended the East India Company — and handed the subcontinent to the Crown for ninety more years.

A freight train approaching the west portal of the Belden Hill Tunnel in Broome County, New York - the site of the 1869 railroad war between the Albany and Susquehanna and Erie railroads

The battle of Susquehanna

Mar 28, 2026 By Andy Barca

In August 1869, Jay Gould attempted to seize the Albany and Susquehanna Railroad the same way he did everything else: through bribed judges, forged shares, hired men, and when those failed, a train full of armed roughs sent toward another train full of armed roughs.

Nationalist soldiers raiding a suburb of Madrid in March 1937

The City That Held Out Too Long

Mar 28, 2026 By Andy Barca

On 28 March 1939, Madrid fell to Franco's forces after a siege that had lasted nearly two and a half years. The war ended days later. The reprisals lasted much longer.