The history of Cartagena de Indias: from Puerto Hormiga to UNESCO status
Cartagena earned its nickname the hard way. La Heroica, the Heroic City, isn’t a marketing line, it’s a scoreboard. Pirates, a 23,000-man invasion fleet, and a fifteen-month siege all tried to take it. Most of them lost, and quite a few of the names involved will already be familiar from a British school history lesson.
Before Spain: Puerto Hormiga and Calamarí
People were living around Cartagena Bay long before anyone called it that. The Puerto Hormiga culture settled the area as far back as 4000 BC, leaving behind some of the oldest ceramic artefacts found anywhere in the Americas. By the time the Spanish arrived, the bay belonged to Mocanáes villages of the Carib linguistic family, centred on a settlement called Calamarí, on the very island where downtown Cartagena now stands.
1533: a Spanish city is founded
Conquistador Pedro de Heredia founded the Spanish city on 1 June 1533, naming it after Cartagena, Spain. The location wasn’t an accident. A sheltered natural harbour, close to the Magdalena and Sinú rivers, made it the obvious gateway for shipping Bolivian silver from Potosí back to Spain, and a key port under the asiento trade system that brought enslaved Africans into the Spanish colonies. That wealth flowing through the harbour is exactly what put a target on the city for the next two centuries.
A magnet for pirates and privateers
Cartagena’s money problem became a military problem fast.
In 1586, Sir Francis Drake attacked and held the city for ransom, a humiliation that exposed just how undefended it really was. King Philip II responded by commissioning Italian military engineer Bautista Antonelli to design the fortification system that still rings the old town today.
It wasn’t enough. In 1697, French privateers Baron de Pointis and Jean Baptiste Ducasse breached the defences and plundered the city outright. Cartagena rebuilt again, this time under Juan Díaz de Torrezar Pimienta.
Offshore, the stakes got even higher. In 1708, a British squadron under Commodore Charles Wager intercepted a Spanish treasure fleet near Isla Barú and sank the galleon San José, along with tons of gold and silver aboard it. That wreck is still there today, one of the most valuable ever lost at sea, and one that occasionally resurfaces in British naval history reading for exactly that reason.
The impossible siege: Blas de Lezo against Admiral Vernon
The city’s defining military moment came in 1741, during the War of Jenkins’ Ear, a conflict named, rather memorably, after a British sea captain’s severed ear. British Admiral Edward Vernon arrived with a fleet of 186 ships and more than 23,000 men, one of the largest amphibious forces assembled anywhere before the 20th century, and, at the time, Britain’s own supposed guarantee of victory. Spanish commander Blas de Lezo, nicknamed “El Medio Hombre” after losing an eye, an arm, and a leg in earlier battles, had roughly 2,800 men and 6 ships to work with.
He held. On land, Castillo San Felipe de Barajas held the high ground throughout the assault. Vernon’s siege collapsed, and the failure was significant enough that England had already minted commemorative coins celebrating a victory that never happened, coins that still turn up at auction as an awkward little footnote to the whole affair.
By the late 1700s, engineer Antonio de Arévalo had finished the job Antonelli started: an underwater stone jetty across the Bocagrande channel that sealed it to deep-water ships entirely, forcing all naval traffic through the narrow, heavily defended Bocachica channel between Tierra Bomba and Barú instead. That defensive engineering is its own story, covered in full in the Barú and Tierra Bomba guide.
Independence, and what it cost
Cartagena didn’t just want independence, it wanted to go first. On 11 November 1811, under leaders including Manuel Rodríguez Torices, the city declared absolute independence from Spain, the first fully independent republic in New Granada.
Spain didn’t accept that quietly. From August to December 1815, royalist forces under General Pablo Morillo laid siege to the city. Over a third of the population died of famine and disease before Cartagena fell. It’s a brutal number, and it’s the reason “La Heroica” stuck as a name rather than a slogan. Simón Bolívar’s forces liberated the city for good in 1821.
UNESCO and the modern city
In 1984, UNESCO designated Cartagena’s colonial walled city and its fortifications a World Heritage Site, formal recognition of what a rare, intact example of Spanish colonial military architecture the city actually is. Walk the walls today, roughly 13 kilometres of 16th to 18th century coral stone, and you’re walking the same defences that outlasted Drake, French privateers, and the largest fleet Britain ever sent against a single port.
Today you can experience this history in person by visiting Cartagena in one of our Organised trips to Colombia.
