(with apologies to Levi for stealing his tweet for the title)
I’ve mentioned before that putting up discarded blog ideas on Twitter lead to the discovery that I have no idea what you people want. And it turned out, when I did this ages ago, that at least two of you want a really nitpicky point about a 966 diploma of King Lothar for the Mont-Saint-Michel. It got put on the back-burner for a while because for a moment it looked like it was going to be trickier than I thought it was, but actually it isn’t, it’s written up, and it’s ready to rumble.
So, what’s the story? Well, first of all, there’s a relatively long-standing debate over whether this diploma is forged, and if not how much of it is interpolated. This has wider ramifications than just shoving another royal precept in the Unecht basket: the Mont-Saint-Michel was on the frontier between Bretons and Normans.
Our old friend Dudo of Saint-Quentin claims that Duke Richard I of Normandy (with whom we have some prior acquaintance*) sent in a bushel of monks to reform the abbey, but it doesn’t look like this dragged the Mount undisputedly into the Norman duke’s orbit, to say the least, and Dudo being Dudo, if it were just him we’d raise eyebrows about whether or not it happened. But, we have this diploma.
As it happens, some scholars have thought that Richard I messing around that far west is so unlikely that the diploma must be a fake. The argument is that it must have been produced in the early eleventh century – when we know the Norman rulers had a presence that far west – rather than the mid-tenth – when they can’t possibly have done. There is a prima facie case to answer here. The reason for that is that the diploma as it currently exists includes reference to a papal bull of Pope John XIII which was definitely an early eleventh-century forgery. So it’s definitely been interpolated; but was it outright forged? As I said, some scholars think so. I don’t.
That reason is the prologue. The diploma’s prologue begins ‘If We confirm that which Our predecessors, illuminated by divine esteem…’ It appears to have originally comes from the abbey of Saint-Denis in the 860s, and shows up in a few diplomas of Charles the Bald making Very Serious Arrangements for organising Church estates; but the specific version of the formula that the Mont-Saint-Michel diploma is copying was issued for the cathedral at Rouen in around 872. (Incidentally, actually looking this up required an awful lot of intense diploma research before I discovered there’s an entire book which is specifically a reference work for this topic, which would have resolved the whole question in about five minutes…)
The fact that this formula was in the Rouen Cathedral archive and nowhere else goes well with another detail from the diploma. Lothar’s act doesn’t mention anyone from the Mont itself petitioning for it, but it does say that Archbishop Hugh of Rouen did. Normandy in 966 was not exactly drowning in very solemn royal diplomas (and, actually, if Hugh – originally a monk from Saint-Denis – was familiar with his old house’s archive he would have had extra associations with prologues of this type), so the most plausible scenario is that Hugh brought this formula with him when petitioning Lothar for the diploma. Point is, having that prologue in this diploma requires that it was produced for a Norman visit from Rouen to Lothar’s court in the 960s rather than cooked up out of whole cloth in the Avranchin in the 1020s.
This in turn means that we can say with some confidence that the Norman rulers were successfully claiming authority over Brittany in the second half of the tenth century. In general, I think in general the evidence for Norman involvement in the area which would eventually become western Normandy tends to be downplayed, not least because it looks weird by the standards of people expecting the strong and stable government of early eleventh-century upper Normandy – but it’s pretty convincing for a vaguely-conceived but nonetheless-important hegemony over a factionalised borderland.
* Back when I was first drafting this, I got @-ed into a discussion thread about the then-recent proposal to move the Bayeux Tapestry, and it turned out that people are actually reading my articles; and I know that’s the point but I still got unnerved. Does anyone else find this?