The roughly 2,000-year-old tomb was found underneath another, 1,300-year-old tomb filled with treasures such as jade gorgets - normally used to protect the throat - beads, and ceremonial knives.
The upper tomb's corpse had been badly destroyed by rodents within the last few centuries, but the body was clearly that of another Maya ruler - perhaps another female, based on the small size of a ring found in that tomb.
The royal burials are the first discovered in Nakum, once a densely packed Maya center. Study co-author Wiesław Koszkul and colleagues have been investigating Nakum's surroundings, known as the Cultural Triangle, for decades. (Explore an interactive map of key Maya sites.)

A woman ruler's skeleton—her head mysteriously placed between two bowls—is one of two royal burials recently found at the Maya ruins of Nakum in Guatemala.
The Maya royal-tomb discoveries are described in the September issue of the journal Antiquity.
Into the Abyss
The ancient structure had been completely overtaken by jungle growth before excavations began in 2006, and only a small hill covered in soil and vegetation hinted at its existence.

Archaeologists descend into Nakum's pyramid, formally known as Structure 15, in an undated picture.
Once inside the first level of the tomb, the scientists noticed cracks in the floor. When they cut through the floor, they found the second, older crypt.
"I think we could find some more burials beneath the level we excavated, [but] our excavations - our test pits - are very narrow," Koszkul said. "We can't excavate everything."
Head in a Bowl
The scientists don't know exactly why the body was buried with bowls, "but we have seen similar patterns in Tikal," a site also in Guatemala that was one of the most powerful pre-Columbian Maya cities, Koszkul said.
The royal figure's gender also took the researchers by surprise, he added.

The head of the dead woman found in the 2,000-year-old tomb was covered by a vessel, which is pictured above containing fragments of her skull.
Pristine Tomb
The researchers know the person buried inside this tomb was of high status: Not only was the body accompanied by a number of treasures, but the offerings continued for two centuries after the burial. (Take a Maya quiz.)

Archaeologists excavate the upper level of the Structure 15 pyramid in a picture taken in 2008.
Circle 11 in this photograph contained limestone bars, perhaps used to make fishing nets, while Circle 12 contained clay cooking plates and blue-painted knives, probably used for ritual offerings.
Sacrificial Knives?
At least four of the knives were painted with a blue pigment-the same color the Maya would paint victims before they were sacrificed, hinting that the knives were also used for ritual killings.

Nine flint knives dating to the Late Classic period (A.D. 600 to 700) were excavated from the upper royal burial.
By A.D. 800 to 900, the Maya had begun to abandon Nakum and surrounding cities in the Classic Maya collapse, though scholars don't yet agree on why. (Read more about the rise and fall of the Maya in National Geographic magazine.)

Three signet rings bearing stylized representations of faces were among artifacts deposited directly above the 1,300-year-old ruler at least a hundred years after he or she was buried.
"They probably still remembered there was a large tomb [here] important for Nakum," he said.
Jade Jewelry
The glyphs on the gorget are a partial mystery: Simon Martin of the University of Pennsylvania translated the name of the person as Ixim Chan, or "Maize God-Snake." But the jade piece also contains the word "Yaxha," the name of a city 10.5 miles (17 kilometers) south of Nakum.

Jade Jewelry
Photograph courtesy Robert Słaboński, Nakum Archaeological Project
This jade pectoral, or gorget, was worn as part of a larger necklace across the chest of the ruler buried in the upper tomb.
The style of the glyphs is 300 years older than the tomb itself, raising the possibility that the pectoral was kept as a family heirloom for three centuries, he added.
Pyramid in 3-D
In the foreground, a drain is visible in front of Structure 14, which may have contained a second tomb or a funerary temple that served as a temporary holding place for corpses. However, the chamber had been looted, and its function may remain unknown.

Structure 15, the burial pyramid, is seen in the background in an artist's 3-D reconstruction.
Possibly a cistern located between the buildings would store water until a king would begin a "water spectacle" for citizens watching from the patio to the west.
"We think this drain may have been used in elite-sponsored spectacles of the water god," he said.
Mayan nuns could be spooky, as they often tended sacrificial victims and prepared them for death. That might explain why no one bothered her tomb. That's just a guess.