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attended by two or three dealers in antiquities who often had extended ‘conversations’ with club members in the car park.

      In the 1980s metal detecting grew rapidly in popularity. Even if they had wanted to – and many did – archaeologists would never have been able to make the hobby vanish. It was clear that it could never be banned, because the law could not possibly be enforced: detectorists would be driven underground, and if that happened, any chances of monitoring what they were finding would disappear. As it is, it’s hard enough to prevent dedicated illegal ‘nighthawks’ from detecting over legally Scheduled Ancient Monuments (sites of national importance granted statutory protection).

      While the attitude of most archaeologists in the early 1980s was hardening, one exceptional and farsighted individual, Tony Gregory, began to work with detectorist clubs in Norfolk. Pretty well single-handed he started to change archaeological attitudes. He was a close friend of mine (sadly he died in 1991 of cancer), and I spent several smoky evenings upstairs in Norfolk pubs while club members showed him their latest finds and he made notes of where they had been found. As he pointed out, it was bad enough that the finds were being removed in the first place, but it was an archaeological catastrophe that their findspots were being lost too. Those findspots are archaeologically every bit as important as the objects themselves.

      Eventually the government bowed to archaeological pressure to regulate what was going on. In 1997 it sponsored the Portable Antiquities Scheme, which exists to ensure that findspots are recorded and major new finds are saved for the nation.19 This work is carried out by regional FLOs, or Finds Liaison Officers, who have the tricky task of retaining the trust of both archaeologists and detectorists. Even despite the Portable Antiquities Scheme, I still find the haphazard removal of finds from their contexts a very difficult moral dilemma, and one made no simpler to resolve by the outstandingly important new information that has recently begun to emerge.

      This new information is transforming our understanding of trade and exchange in northern Europe between the seventh and tenth centuries, and it is doing this by means of so-called ‘productive’ sites. The term was coined (pun unintended) by numismatists, and would never have been chosen by archaeologists, who might have dubbed them ‘rich’ or ‘significant’ sites. To me, ‘productive’ is a word one might attach to an oil well. That quibble aside, ‘productive’ sites have turned the world of Middle Saxon archaeology upside down – with more than a little help from some distinguished specialists in ancient coinage.20

      The four hundred years between 600 and 1000 (the seventh to eleventh centuries) are now seen to have been a period of economic renewal following two centuries when northern Europe was searching for new identities and direction, following the demise of the official Roman Empire in the west. I say ‘official’ because some form of Romanised authority did continue, but it had now been devolved to local and regional government. The Church, which had become the favoured religion of the Roman Empire under Constantine from AD 324, also played an important role in maintaining such government during a period which archaeologists and historians now refer to as Late Antiquity.

      The new economic order seems to have been arranged around a series of major commercial centres, known as emporia in Latin and wics in Anglo-Saxon or Early English. Finds from the emporia in Britain and on the Continent are characterised by their richness and range. Most importantly they provide clear and unambiguous evidence for long-distance trade. These sites sprang up quite rapidly around the coasts of northern Europe, and their arrival coincided with the appearance of a widely adopted silver coinage which became the common currency for the emerging states around the shores of the North Sea. The importance of the emporia has been recognised for some time, and it was believed that they came into existence in the earlier seventh century as seasonally occupied trading centres, operated by independent merchants who worked outside aristocratic or elite control.21 It was believed that from about the 670s they began to come under such control. But following discoveries such as the magnificent burial at Prittlewell (AD 650) at the emporium or wic of Ipswich, we now realise that these places were probably under royal or elite control from the outset. That is not to say, however, that they were not also well integrated into the local economy, or that specialist traders were not also involved. They almost certainly were.

      The emporium system was essentially elite-driven: it was all about power, prestige and display in the highest echelons of society. We now understand that while such motives were undoubtedly significant, many more people were involved, and it has become possible to see the whole process in far broader terms. It is becoming clear that the emporia formed the pinnacles of an integrated trading system that was united not just by ships and the sea, but by the network of good roads that had been established by the Romans, and had never been completely abandoned.

      The true significance of ‘productive’ sites has only slowly filtered into the academic literature, largely because the realms of academia and metal detecting rarely come into contact. Archaeologists and numismatists are rather better at making such contacts, so the new discoveries have gradually been surfacing in journals and websites devoted to those particular interests. As the information is largely derived from metal detectors it is biased in favour of non-ferrous finds, because most of the machines used today have a discriminator function which allows iron to be screened out. The reason is that the modern ploughsoil is richly scattered with millions of old nails, many of them derived from the ash of scrap timbers burnt on farmyard muckheaps to add potash to the manure. Signals from these nails tended to drown out other signals in the metal detectorist’s headphones. Iron nails, it must also be said, are of no commercial value. So all iron finds, and usually non-metal finds too, such as pottery, tend to be ignored, thereby biasing the information enormously. Were archaeologists to excavate and metal detect ‘productive’ sites, they would plot and keep everything.

      This mass of new information is appearing not just in England, but in Europe too. Places like Holland and Denmark have decided to cooperate with the detectorists, and as a result information is flooding in. Elsewhere, however, in Germany, France and Italy, for example, the hobby is still illegal, so new discoveries in these countries are happening very much more slowly, and through traditional means, such as official excavation. We know that illegal finds from these countries are entering the black market. We also know that some are being given false provenances in countries where detecting is less frowned upon.

      It is becoming clear to numismatists working with this new material that there was something approaching an explosion of coin-making around AD 700. To give some idea of its scale, the volume of money then in circulation in southern England was not to be paralleled until the thirteenth and fourteenth centuries. The situation in Britain was mirrored on the Continent, and it is now quite clear that the ‘explosion’ in currency production represents a sudden increase in trade across large parts of northern Europe.

      There is good evidence to suggest that the coins from ‘productive’ sites were still more or less in situ when the detectorists found them. This would suggest that at such sites coin-loss equates with coin-use. In other words, we can safely assume that the coins were mislaid during trade, and were not placed in the ground as offerings, or concealed in hoards for safekeeping in times of strife. This assumption is based on the distribution of finds from ‘productive’ sites, which are spread across the landscape and do not occur in small, tight clusters. Numismatists have shown, moreover, that the coins found on one site reflect those from others. Changes in currency tended to happen across regions, which again suggests trade rather than hoarding and burial (often hoards contain antique or outdated coins kept purely for the value of the gold or silver they contain).

      Analysis of the coin finds from ‘productive’ sites and other smaller ‘hot spots’ is still at an early stage, and so far no new mints have been identified, but we can be reasonably sure that the patterns revealed in these new and very early distributions are ‘real’ – in the sense that they reflect ancient trade. One example will suffice. Detectorists have discovered an isolated ‘hot spot’ of late-seventh-century Early Saxon coins, known as ‘primary porcupine sceattas’,* in the upper Thames

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