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On Mondays I go looking for blue in things people once wore or carried. This week I went back to something I saw years ago in Madrid, at the Museo Arqueológico Nacional.
It was in one of those low cases where you have to bend down to see it properly. a small oval plaque in Limoges enamel, about thirteen centimetres high, made of copper. The edge is scalloped, like an old flower that’s been worn smooth by time. Along the border there are these tiny holes. I never quite figured out what they were for at the time. I took some photos, scribbled a few notes, and the piece just stayed with me.
This week I finally decided to dig deeper and understand what I was actually looking at.
MAN inventory number 52128. Copper and enamel, cast and enameled. Dated between 1490 and 1499 — the last decade of the fifteenth century. It comes from the Miró collection and was exhibited in 1997 in Aachen, in a show dedicated to medieval and Renaissance enamels and ivories from Spain.
The museum describes it as a broche de capa pluvial — a clasp for the cope, the ceremonial liturgical mantle. But there is one detail that made me stop: the twelve holes around the edge, according to the same catalogue entry, might mean the plaque was sewn not onto a garment, but onto a banner or a standard. So maybe not something a priest wore during mass, but a sacred image raised up high, carried in procession, visible from a distance to a crowd.
We will probably never know for sure. The object has survived more than five hundred years without keeping the context it was born in. What remains is the image… and the color.
What is inside the image
The subject is the Tree of Jesse, one of the most effective ways medieval art found to tell an entire genealogy in a single scene. It comes from a verse in Isaiah about a shoot growing from the stump of Jesse, father of King David and, through a long line of descent, ancestor of Christ.
In the plaque, Jesse lies at the bottom, asleep, at the base of the composition. From his body grows a tree. On its branches stand his descendants: the museum entry lists four kings of Judah, among them a recognizable David holding a harp. Above them, the Virgin with the Child.
The museum’s own description of the colors speaks of “a rich color palette in shades of blue, gold, and black,” which enhance the chiaroscuro effect. Blue is the first color mentioned. That is not by chance.
Why blue
This is where I get to the reason I came back to this piece on purpose, on a Monday.
In the Middle Ages, blue was the most precious pigment, lapis lazuli, came from only one place in the known world: the mines of present-day Afghanistan, in the Badakhshan region. The stone was extracted there, crossed Central Asia along caravan routes, reached the ports of the eastern Mediterranean, and from there was shipped toward Venice, which controlled most of its trade in Europe.
The name we still use today, ultramarine, also comes from this route: “beyond the sea.” The pigment carried its own origin story inside its name.
Turning the raw stone into usable pigment was a long process: the stone was ground, then purified for days, mixed with resins and oils, worked and reworked to separate the pure blue from the grey rock around it. From kilos of stone came only a few grams of pure pigment. In certain periods, it cost more than gold by weight.
For this reason, in medieval sacred art, lapis lazuli blue was reserved. And it was reserved, almost always, for one figure only: the Virgin Mary.
Mary’s mantle
This was a code that took shape in the late Middle Ages and grew stronger through the fourteenth and fifteenth centuries. Exactly the years our enamel was made in.
Blue carried several meanings at once. It was the color of the sky, and therefore of the divine, fitting for Mary’s role as a bridge between the human and the sacred. It was also, because of its rarity and cost, a royal color: using it for the Madonna meant, implicitly, crowning her as Queen of Heaven, Regina Coeli, a title the liturgy gave her directly. And there was a third, more practical reason: choosing such an expensive pigment for this one figure was also a way for whoever commissioned the work to show, through the expense itself, how much that figure was worth.
In our plaque Mary’s mantle is blue, dense, almost night-like. The same blue covers the eight lobes around the outer edge, each one dotted with small white enamel stars. When I noticed this in person, I stayed in front of the glass longer than I had planned to.
Night-blue scattered with stars is, in medieval iconography, one of the standard ways to represent the sky. Here, the whole earthly scene, Jesse asleep, the tree growing, the kings among the branches, is framed by eight fragments of starry sky. As if the entire genealogical story unfolded under a small celestial vault made of enamel and copper.
A technical note
There is also a practical reason why blue dominates objects like this one. Champlevé enamel and painted enamel (peint) produced in Limoges, from the high Middle Ages onward, relied on cobalt blue as one of the most stable and long-lasting colors available. It held up well during firing, kept its intensity over time, and worked perfectly as a background for gilded figures — which is why Limoges workshops, already in the twelfth and thirteenth centuries, used it as an almost universal background color on reliquaries, chalices, and crosses.
In our piece, from the late fifteenth century, this older technical tradition merges with a more Gothic and narrative language: blue becomes an iconographic element, the mantle of one specific figure, the color of one specific sky.
I have gone back to that display case at the MAN many times in my mind over the years. The blue spoke to me before I even knew what I was looking at. It was the most expensive, most deliberate part of the whole object. It was how a craftsman in Limoges, about whom we know almost nothing, told us where to look, and what, in that small golden forest of kings and prophets, actually mattered.
Chasing blue, once again, took me exactly where it wanted to take me: toward the reason that object chose to speak to me through this one color, and not another.
