Leiden Plaque: A Maya Jade Record of a King's Accession in 320

The Leiden Plaque is a small carved jade plaque made by the Maya in the early 4th century AD. Its inscription records the accession of a king on a day in AD 320, and for nearly a century after its discovery in 1864 it held the earliest Long Count date known from the Maya lowlands. Now kept in Leiden, in the Netherlands, it remains one of the most important early documents of Maya kingship.

Discovery

The plaque was found in 1864 near Puerto Barrios, on the Caribbean coast of Guatemala, during digging connected with a canal or engineering project directed by the Dutch engineer S. A. van Braam. It was taken to the Netherlands and entered the collection of the national ethnographic museum in Leiden, today the National Museum of Ethnology (Museum Volkenkunde).

Because of where it was kept, the object became known in English as the Leiden Plaque or Leyden Plate. Puerto Barrios lies far from the great cities of the central Maya lowlands, so the plaque had almost certainly travelled from its place of origin, perhaps through trade, gift exchange or looting in ancient times.

The object

The plaque is a thin, flat piece of polished jadeite about 21.5 centimetres long and roughly 8 centimetres wide, carved on both sides with fine incised lines. Jade was the most precious material in Mesoamerica, valued more highly than gold, and was associated with water, maize and life.

Plaques like this were probably part of a royal belt. Maya kings are often shown wearing belts from which hung several jade plaques and a mask or head ornament.

The king’s portrait

One side shows a richly dressed ruler standing in profile. He holds a double-headed serpent bar across his chest, a symbol of royal power, with small deities emerging from the open jaws at each end. Behind him hangs a belt ornament, and an elaborate headdress rises above his head.

At his feet lies a bound captive, his body twisted on the ground. Showing a king standing over a defeated enemy was a common theme in Maya art and emphasised the ruler’s role as a war leader. The portrait closely resembles royal images on early stelae from Tikal, such as Tikal Stela 29, which points to a common artistic tradition.

Carving jadeite was slow, skilled work. The stone is extremely hard, so artisans shaped and incised it with abrasives such as sand, cords and tools of harder stone or bone. A finely engraved royal plaque like this one represented many hours of specialist labour and was a mark of the highest status.

The inscription and date

The other side carries a column of hieroglyphs. It begins with a Long Count date, 8.14.3.1.12, followed by the Calendar Round position 1 Eb 0 Yaxk’in. In the most widely used correlation this corresponds to a day in mid-September AD 320; the exact day given varies by a day or two depending on the correlation and on whether the Julian or Gregorian calendar is used.

The text then records the “seating” of a ruler, the Maya expression for coming to office. His name glyphs were nicknamed “Moon Zero Bird” by earlier scholars. Many specialists connect him with Tikal, since the style and some of the glyphs match Tikal’s early monuments, but whether he ruled Tikal itself or a related kingdom is not certain.

Importance for Maya studies

When epigraphers began to decipher Maya dates in the late 19th and early 20th centuries, the Leiden Plaque was an essential document. Its date of AD 320 was for decades the earliest known from the Maya lowlands and was used to mark the beginning of the Classic period.

In 1959 the discovery of Stela 29 at Tikal, dated to AD 292, pushed the record back. The plaque remains significant, however, as a rare portable object with a precise date, and as a clear early example of the image of the Maya king as warrior and holder of sacred power. Its use of jade continues a tradition of carved greenstone that goes back to the Olmec civilization more than a thousand years earlier.

Timeline

• AD 292: Tikal Stela 29 is dated, the earliest known lowland Long Count monument.
• AD 320, September: The accession recorded on the Leiden Plaque takes place.
• 1864: The plaque is found near Puerto Barrios, Guatemala.
• Later 19th century: The plaque enters the collection of the ethnographic museum in Leiden.
• 1959: Discovery of Tikal Stela 29 replaces the plaque as the earliest dated lowland monument.

Why it matters

The Leiden Plaque packs into a few centimetres of jade the central ideas of Classic Maya kingship: the ruler as warrior, the sacred serpent bar and the precise recording of dates. It shows that by AD 320 these traditions were firmly in place, and its long journey from Guatemala to Leiden is a reminder of how much Maya history is scattered in collections far from its source.