Latest / The History of Ireland: Rebellion, Empire, and Independence — Fexingo History / The Down Survey: How William Petty Mapped Ireland for Cromwell
Transcript
- Lucas: So we've talked a lot about the big dramatic moments — battles, rebellions, famines. But I want to zoom in on something that's maybe less flashy but arguably just as transformative: how the English literally mapped Ireland. Luna: You mean like, the first proper maps of the whole island? Lucas: Exactly. And the person behind it was this extraordinary, complicated figure named William Petty. He was a physician, a mathematician, an economist — basically a Renaissance man who showed up in Ireland in the 1650s as a doctor for Cromwell's army. But his real impact came from a survey. Lucas: After Cromwell's conquest — which was brutal, we've covered parts of it — the English Parliament needed to pay off the soldiers and the 'Adventurers' who had financed the war. They had promised them land in Ireland. But to give out land, you first had to know who owned what, which was a mess. Irish landholding was based on Brehon law and centuries of custom, not neat English deeds. Luna: So they had to figure out what was actually there. Lucas: Right. And initially, they tried to use existing surveys — there was something called the Strafford Survey from the 1630s — but it was incomplete and unreliable. So in 1654, Petty proposed a new survey of all the forfeited lands. He called it the Down Survey, because it was to be 'set down' in maps. Lucas: Petty was incredibly ambitious. He proposed to survey over 13 million acres in just over a year. To do that, he used a small army of surveyors — about a thousand men — armed with chains, compasses, and simple measuring tools. They worked parish by parish, barony by barony. Luna: And they actually pulled it off? Lucas: Remarkably, yes. The Down Survey produced the first accurate, large-scale maps of Ireland — detailed enough to record field boundaries, bogs, mountains, and even the names of townlands. Petty's team used a technique called 'traversing' — measuring distances with chains and bearings with compasses — and they tied everything together using a grid of reference points. Lucas: But here's the thing: the survey wasn't just a technical achievement. It was a tool of dispossession. The maps were used to identify Catholic-owned land that could be confiscated. If your land wasn't surveyed as yours, you lost it. And the survey itself was often done with local informants — sometimes disgruntled neighbours — so it had a built-in bias. Luna: So the maps basically became the legal basis for taking land. Lucas: Exactly. Under the Cromwellian Settlement, Catholic landowners were given an ultimatum: go 'to Hell or to Connacht' — meaning they could either move to the barren western province of Connacht, or face execution. The Down Survey determined exactly what land was available for transplantation and for rewarding the soldiers and Adventurers. Lucas: Petty himself became enormously wealthy from this. He was granted about 30,000 acres in Kerry. He also became the Surveyor General of Ireland and later a founding member of the Royal Society. He wrote a book called 'Political Arithmetic' that used the survey data to analyze Ireland's population and economy. He was genuinely brilliant. Luna: But also complicit in a massive land grab. Lucas: Absolutely. And that tension — between scientific progress and ethical cost — is what makes the Down Survey so fascinating. On the one hand, it was a landmark in cartography and statistics. On the other, it was the bureaucratic machinery of ethnic cleansing. Lucas: You know, it's interesting — thinking about how this show itself is a kind of mapping, of sorts, piecing together history episode by episode. If you've been stepping into the past with us, and you'd like to help keep this exploration going ad-free, listeners like you make that possible. There's a page at buy me a coffee dot com slash fexingo where you can toss in a small contribution. No pressure, but it really helps us keep digging into stories like this one. Luna: Yeah, it's a nice way to support the work we do. Lucas: So anyway — back to the survey. One of the enduring legacies of the Down Survey is that it created a template for land ownership in Ireland that lasted for centuries. The maps themselves became official records. If you wanted to buy or sell land, you'd refer to Petty's maps. They were used right up until the Ordnance Survey of the 1830s. Luna: So for almost two hundred years, the shape of Ireland was basically Petty's version of it. Lucas: Exactly. And that version was deeply political. The maps didn't just show land — they showed who had power. Catholic landownership dropped from about 60% in 1641 to around 20% by 1660, and the Down Survey was the instrument that made that possible. It's a story of how knowledge and power are always intertwined. Lucas: There's also a fascinating human side. Petty's surveyors often faced hostility. In some areas, locals refused to cooperate, or they gave false information. There are records of surveyors being attacked, or having their chains stolen. It wasn't just a dry bureaucratic exercise — it was a confrontation. Luna: I can imagine people were terrified of what the maps would mean for them. Lucas: Rightly so. The Down Survey wasn't just a map — it was a sentence. And Petty knew that. He was a pragmatist, not a sentimentalist. He wrote that the Irish were 'a people that are enemies to industry and labour' — a pretty grim view, but it was common among the English of his time. Lucas: After the Restoration of Charles II in 1660, there was some attempt to reverse the land confiscations, but it was mostly a failure. The new regime needed the support of the Protestant landowners who had benefited from the survey. So Petty's maps remained the basis of ownership. The Catholic gentry who had been displaced never got their land back. Luna: So the Down Survey basically locked in the Protestant Ascendancy for centuries. Lucas: That's the argument, yes. And it's hard to overstate how deep that influence was. The landholding patterns created by the survey shaped everything — the landscape of big estates, the poverty of rural Catholics, the political power of the Anglo-Irish. It's one of those quiet turning points that doesn't get the same attention as battles, but it's just as decisive. Lucas: Interestingly, Petty himself had a complicated legacy. He advocated for a union between England and Ireland — he thought it would be more efficient. He also proposed a kind of census and a tax system based on his survey data. Some of his ideas were ahead of their time. But he was also a man who profited enormously from conquest. Luna: It's hard to separate the genius from the opportunist. Lucas: Exactly. And that's the challenge of looking at figures like Petty. He wasn't a simple villain. He was a product of his time, but his work had consequences that lasted long after him. The Down Survey maps are still preserved in the National Library of Ireland — you can see them online. They're beautiful, in a way. But they're also a record of a tragedy. Lucas: If you ever look at a map of Ireland and wonder why the boundaries are where they are, or why certain families own certain lands — the Down Survey is part of that answer. It's a story of science, power, and theft, all drawn in ink on parchment. Luna: And it's a story that's still being told, every time someone traces their family history back to the 1650s. Lucas: Absolutely. The Down Survey is one of those things that's both a technical marvel and a moral wound. And I think that's worth remembering.