There was no blog post yesterday because I was largely on the road back from seeing Hawkwind’s 50th anniversary tour, which practically counts as medieval history itself. Today, however, like quite a lot of the UK academy, I am on strike, and so I have time to make up for that omission. Indeed, if I do it right, I should have time to do some serious blog catch-up work, though if you are in the Leeds area, you may be interested to know that, with my colleague Dr Francesca Petrizzo, I am participating in the local University and College Union’s teach-out at the Quaker Meeting House on Woodhouse Lane on the 28th November, at 14:00-15:00, and that is open to the public, so you could come along and learn from us about ‘The Medieval Mediterranean: Race and Religion’. Maybe see you there! But if not, here is a blog post of a more normal kind, and more will hopefully follow.
So this post got stubbed while I was redrafting the article which became ‘Outgrowing the Dark Ages’ back in May 2016.1 I have written here before about the footnote that you have slaved over, that has grown far too big because it is really a tangent from the article or chapter and, in the final redraft, even as you edit it you know will, in the end, have to be cut. This is one of those. In the end, it did survive in a form, but much truncated.2 The problem of the article, as you may already have seen, is that people have generally misapplied the few numbers we have for agricultural productivity in the early Middle Ages, and that the person who did this with most success, in as much as he has been replicated all over the place, was Georges Duby. But he was not alone in doing bad maths with agricultural figures, and that’s where we come in… (The footnotes I have added; I don’t go quite as far as having footnotes in my footnotes. Not yet.)
“Of course, not everything that has been badly calculated about early medieval crop yields can be placed at the door of Georges Duby. Just as there is good reason to doubt his figures on the basis of experiments in Catalonia, so also there are Catalan attempts at such arithmetic that likewise fail to be justifiable.3 In a study of the ninth-century foundation and refoundation of the Pyrenean monastery of Sant Andreu d’Eixalada and then Sant Miquel de Cuixà, Ramon d’Abadal i de Vinyals noticed in the will of the monastery’s major patron, Protasi, a bequest of all the cereals in the monastery compound, enumerated as 365 modios.4 Courageously, he assumed that this was close to or actually the yield from the probably-recent harvest, and then combined these figures with an earlier donation of an estate by Protasi where annual renders are given, ‘4 houses and a courtyard and 6 orchards and 12 vineyards, and the 30 quinales of wine that go out from there and there are 8 tonnae and 30 modii of corn’. Using this to establish a basic render figure of 7.5 modii of corn per house, Abadal then used the monastery total figure to estimate the house’s total landed endowment. This ingenious operation involved not just the assumption about proximity to the harvest and a myriad of other assumptions, some silent and some supplied in a lengthy footnote, about how much grain was needed to sow a modiata of land and the yield a modiata should produce, all supplied by late nineteenth-century figures from the same area based on a modern calculation of the area of a modiata (‘a little less than half a hectare’). Even if one cared to accept all these assumptions and patches, the essential uselessness of the figures thus obtained should have been apparent to Abadal’s readers when he explained, halfway through the sums, ‘Since we must think, however, that an important part of the harvest relating to these 365 modios of wheat should have corresponded to the direct cultivation of the monastery and not to that of its tenants, if we compute that part at a half…’ For this guess, immediately halving Abadal’s result, there is not even an anonymous nineteenth-century basis and it shows us, again, quite how much needs to be known, when performing such arithmetic, but is not.
“Abadal, however, did not use these numbers to achieve a crop yield ratio: how could he have, when he had already supplied that part of the sum from his unnamed nineteenth-century source? This did not, however, stop Manuel Riu i Riu, in an article about metrology and terms for units, referring to this study as if it contained ninth-century figures for both seed sown and crop yielded.5 The former he based on the equation between the land unit modiata and the modius supposedly required to sow it; the latter he got from Abadal’s own figures, not apparently noticing that these were modern patches for the data lacking in the documents. As it happens, the figures that he gave provide a healthy yield figure of 6.25:1, but they are, of course, founded on absolutely nothing of meaning.”
Now, this is not the first time that we have caught Manuel Riu, superb archaeologist and excellent builder of the scholarly community of medievalists in Catalonia but not always quite as critical in his reading of texts as he needed to be, in a slip, but he was famous for his quantitative work and study of medieval units and measures, and he knew Abadal well, and I’d have hoped that he would read him more carefully; but then I’d also have hoped that Abadal wouldn’t have been quite so creative in his invention of his own data. The whole thing is further proof that if you invent numbers in historiography, people will quote them whatever they rest upon, even when they really shouldn’t. I don’t hope to change that as a whole trend, but it would be nice if I could make people more careful about it in this specific area…
1. Jonathan Jarrett, “Outgrowing the Dark Ages: agrarian productivity in Carolingian Europe re-evaluated” in Agricultural History Review Vol. 67 (Reading 2019), pp. 1–28.
2. Ibid., pp. 20-21 n. 77.
3. For the Catalan reasons to doubt Duby, see my older blog post or indeed Jarrett, “Outgrowing the Dark Ages”, pp. 22-25.
4. Ramon d’Abadal i de Vinyals, “Com neix i creix un gran monestir pirinenc abans de l’any mil: Eixalada-Cuixà” in Analecta Montserratensia Vol. 8 (Montserrat 1954), pp. 125–337 at pp. 160-161, is the relevant source; the reprint in Abadal, Dels Visigots als Catalans, ed. Jaume Sobrequés i Callicó, Estudis i documents 13-14 (Barcelona 1969), 2 vols, I, pp. 377–484, doesn’t have the documentary appendix so lacks this bit.
5. Manuel Riu, “Pesos, mides i mesures a la Catalunya del segle XIII: Aportació al seu estudi” in Anuario de Estudios Medievales Vol. 26 (Barcelona 1996), pp. 825–37, reprinted in Immaculada Ollich, Montserrat Rocafiguera and Maria Ocaña (edd.), Experimentació arqueològica sobre conreus medievals a l’Esquerda, 1991-1994: arqueològia experimental. Aplicació a l’agricultura medieval mediterrània (DGICYT PB90-0430) (Barcelona 1998), pp. 77–82.