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Portrait reconstruction of RBC1
Ancient Individual

A man buried in Guam in the Latte Period era

RBC1
383 BCE - 56 BCE
Male
Late Unai Period Ritidian, Guam
Guam
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Chapter I

Identity

The biological and cultural markers that define this ancient individual

Sample ID

RBC1

Date Range

383 BCE - 56 BCE

Biological Sex

Male

mtDNA Haplogroup

E2a

Y-DNA Haplogroup

O-P201

Cultural Period

Late Unai Period Ritidian, Guam

Chapter II

Place

Where this individual was discovered

Country Guam
Locality Guam. Ritidian Site
Chapter III

Time

When this individual lived in the broader context of human history

RBC1 383 BCE - 56 BCE
Chapter IV

Story

The narrative of this ancient life

The Late Unai Period in Ritidian, Guam, marks a significant era in the prehistoric cultural development of the Chamorro people, traditionally believed to have occurred approximately between 1000 to 1521 AD. This period is characterized by significant advancements in social organization, subsistence strategies, architectural achievements, and artistic expressions.

Geographical Context

Ritidian Point, located at the northernmost tip of Guam, offers a unique setting with its rugged cliffs, fertile limestone forest, and pristine coastal areas. This environment provided the Chamorro people with abundant resources, including marine life from the surrounding coral reefs, and terrestrial flora and fauna.

Social and Political Structure

During the Late Unai Period, Chamorro society was organized into matrilineal clans, with descent and inheritance passed through the female line. The society was stratified, with the magalahi (chiefs) and the matua (nobility) at the top, followed by the achaot (subordinate chiefs or lower nobility), and the manachang (commoners or lower class). This hierarchy was important in maintaining social order and distributing resources and responsibilities within the community.

The Chamorros were also known for their complex maritime trading networks, which extended throughout the Mariana Islands and possibly beyond. Canoes and other seafaring vessels were vital for trade and communication, enhancing cultural exchanges and resource distribution.

Architectural and Technological Innovations

One of the most defining elements of this period is the construction of latte structures, which are large stone pillars capped with hemispherical stones. These served as foundations for raised dwellings or community structures. The latte stones found in Ritidian and other parts of Guam reflected the Chamorros' architectural ingenuity and are significant cultural symbols even today.

Technological advancements during the Late Unai Phase included the refinement of tools and artifacts made from stone, bone, and shell. These tools were used for fishing, agriculture, and daily activities, indicating a well-adapted lifestyle to their island environment.

Subsistence and Economy

The economy of the Late Unai Period was primarily based on fishing, agriculture, and foraging. The abundant marine resources were exploited using various fishing techniques, such as netting, spearfishing, and the use of fish traps. Agriculture was practiced through the cultivation of taro, yam, and breadfruit, which were staple crops for the Chamorro diet.

The Chamorros also practiced animal husbandry, with domesticated animals such as pigs and chickens complementing their diet. The integrated approach to subsistence demonstrated a keen adaptability to the natural environment.

Cultural and Artistic Expression

Cultural expressions of the Late Unai Period are evident in the Chamorros' pottery, which evolved into complex decorative forms with intricate designs. Pottery was an essential part of daily life, used for cooking, storage, and ceremonial purposes. The artistic designs often symbolized status, clan identity, or spiritual beliefs.

Additionally, Chamorro oral traditions, music, and dance played a crucial role in maintaining social cohesion and transmitting cultural values. Myths and legends were shared orally, preserving the history and cosmology of the Chamorro people.

Spiritual and Ritualistic Practices

The Chamorro worldview was deeply spiritual, with a belief system that involved ancestor worship and reverence for the natural environment. Rituals and ceremonies were conducted to honor ancestors, seek guidance, and ensure harmony with the spirits of the land and sea. Shamans, known as makåhna or suruhånu/suruhåna, were respected figures responsible for spiritual and medicinal practices.

Conclusion

The Late Unai Period at Ritidian represents a pinnacle of Chamorro culture, characterized by societal complexity, architectural prowess, and vibrant cultural traditions. Despite external pressures and eventual changes due to European contact and colonization, the legacy of this period continues to influence contemporary Chamorro culture and identity. The archaeological remains at Ritidian and other sites across Guam provide invaluable insights into the lifeways of the ancient Chamorros, celebrating their resilience, creativity, and enduring cultural heritage.

Chapter V

Genetics

The genetic ancestry of this ancient individual

Modern Genetic Admixture

This analysis compares the DNA profile with present-day reference populations, showing what percentage of genetic makeup resembles modern populations from different regions.

Asia 91.8%
Chinese & Southeast Asian 90.5%
Chinese 52.3%
Vietnamese 38.2%
Arab, Egyptian & Levantine 1.3%
Arabian 1.3%
Europe 4.0%
Northwestern European 4.0%
Scandinavian 4.0%
Oceania 2.8%
Melanesian 2.8%
Papuan 2.8%
Africa 0.9%
African Hunter-Gatherer 0.9%
African Hunter-Gatherer 0.9%

Closest Modern Populations

These are the modern populations showing the closest statistical alignment to A man buried in Guam in the Latte Period era, ranked by genetic distance. Lower distance values indicate closer statistical similarity.

1
Kinh Vietnam
2.3633
Chapter VI

Context

Other ancient individuals connected to this sample

Sources

References

Scientific publications and genetic data

Scientific Publication

Ancient DNA from Guam and the peopling of the Pacific

Authors Pugach I, Hübner A, Hung HC
Abstract

Humans reached the Mariana Islands in the western Pacific by ∼3,500 y ago, contemporaneous with or even earlier than the initial peopling of Polynesia. They crossed more than 2,000 km of open ocean to get there, whereas voyages of similar length did not occur anywhere else until more than 2,000 y later. Yet, the settlement of Polynesia has received far more attention than the settlement of the Marianas. There is uncertainty over both the origin of the first colonizers of the Marianas (with different lines of evidence suggesting variously the Philippines, Indonesia, New Guinea, or the Bismarck Archipelago) as well as what, if any, relationship they might have had with the first colonizers of Polynesia. To address these questions, we obtained ancient DNA data from two skeletons from the Ritidian Beach Cave Site in northern Guam, dating to ∼2,200 y ago. Analyses of complete mitochondrial DNA genome sequences and genome-wide SNP data strongly support ancestry from the Philippines, in agreement with some interpretations of the linguistic and archaeological evidence, but in contradiction to results based on computer simulations of sea voyaging. We also find a close link between the ancient Guam skeletons and early Lapita individuals from Vanuatu and Tonga, suggesting that the Marianas and Polynesia were colonized from the same source population, and raising the possibility that the Marianas played a role in the eventual settlement of Polynesia.

G25 Coordinates

The G25 coordinates for sample RBC1 can be used for detailed admixture analysis in our G25 Studio tool.

RBC1,0.0202143,-0.41894994,-0.04060368,-0.06150554,0.1096117,0.0569887,-0.0004043,-0.00465502,-0.01716694,-0.00788166,-0.00032012,0.00069242,0.00293102,-0.00962496,0.00100594,0.00262732,0.00858332,-0.00264908,-0.00167382,-0.01362794,0.0122142,0.0105814,0.01829516,0.00325076,0.0055175
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