The period between 450 and 350 BC is regarded as a time of significant social change during the European Iron Age, with numerous processes of transformation, instability, conflict, and mobility unfolding across the European continent. However, in contrast to other episodes of abrupt social transformation, this period has received considerably less attention: it has been understood as a starting point or a sudden change but not usually researched in its own right.

The present study begins by reviewing different European archaeological contexts, exploring how this century is usually interpreted as a significant break. Next, the focus will shift to a specific region, north-west Iberia, in order to identify changes in patterns of occupation and social dynamics. The primary objective is to examine the shift that occurred around 400 BC, identify any common pattern or trend across different regions, and assess long-term consequences. Finally, I propose a series of interpretations at different scales, aiming to raise some possible hypotheses for understanding the development of this brief yet eventful period.

Durable architecture is a hallmark of Polynesian chiefdoms, associated with centralised control of residential and agricultural land. Previous work in West Polynesia has indicated a relatively late date for the onset of such construction activity—after AD 1000—suggesting that political development was influenced by events such as post-colonisation migration. The authors report new dating evidence from the excavation of a large earth mound on the island of Tongatapu. Its construction 1500 years ago indicates that, in contrast to previous findings, well-developed chiefdoms and field monuments probably dominated the landscapes of West Polynesia substantially prior to the colonisation of more easterly island nations.

This article investigates the rise of social complexity of Cahokia's multiethnic city through a robust stylistic grammar analysis of early Caddo fine ware vessels at Cahokia's East St. Louis Precinct. We explore ceramic production and distribution to shed light on whether Caddo-like fine wares were produced by Caddo potters who lived and crafted at Cahokia, were produced by local Cahokia potters who copied Caddo motifs, or were imported to Cahokia from the southern Caddo area. This investigation helps us better understand the nature of Caddo connections at the beginning of Cahokia's development and provides a means of identifying and interpreting new levels of social interactions between the Caddo world and Cahokia. The stylistic grammar results show that the majority of the Caddo-like vessels at Cahokia have identical stylistic grammar as vessels from the Caddo world. This strongly suggests that Caddo craft specialists migrated to, lived, and crafted their homeland vessels at Cahokia and thus were key social actors in its development.

Physical violence and social conflict have been widely studied in the ancient societies of the Andes. However, studies about violence are scarce for the Formative period of northern Chile (1000 BC–AD 900). Evidence from these investigations is generally interpreted as interpersonal violence, whose protagonists are mostly men. Here, we present the case of an adult female recovered from the Tarapacá 40 cemetery (Tarapacá region, Chile) displaying lesions suggestive of trauma. We reconstruct her life and death in the context of this era's social and political conditions. Results of our bioanthropological characterization, cranial trauma analysis, carbon and nitrogen isotope analysis, and recording of the funerary offerings suggest she was a local member of the Formative community buried in the Tarapacá 40 cemetery and that she suffered intentional lethal lesions. Her death is unusual because there are no previous bioarchaeological records of lethal violence against women in the Tarapacá region. The osteobiography of this woman reflects a context characterized by an increase in inequality and social complexity, whereby physical violence could be used as a mechanism of internal regulation and exercise of power during the Formative period.

Religion played a key role in the social organisation and political authority of early Andean societies. Excavations at La Seductora in Peru have identified a circular structure with a central hearth and an underground ventilation shaft. The authors argue that the structure belongs to the Kotosh religious tradition, which dominated the central Andes during the Late Archaic and Formative periods (2800–550 BC). Probably representing a small shrine for use by local families, the authors situate La Seductora within the context of power and religiosity in Andean society, providing a model of relevance to similar contexts elsewhere in the world.

The site of Chavín de Huántar, Peru, lies at the heart of developing social complexity in the Andean Formative period. The archaeological contexts on the site's immediate periphery are assessed to investigate the nature of occupation, activities practised, and relationships between the area's inhabitants and Chavín's ceremonial centre. The peripheral Wacheqsa sector, which began as a modest, domestic occupation in the second millennium BC, was reconfigured c. 800 cal BC into a more substantial settlement, perhaps inhabited by craftspeople producing artefacts for the Chavín authorities. The implications of this study are relevant to wider questions regarding relationships between monumental ceremonial centres and their immediate peripheries, and the study of early socio-economic complexity.

Rescue excavations at the site of Macabalaca (PV35-72) in the Huarmey Valley, Peru, identified a rectangular structure with niches on its walls and a floor with a central hearth. We present results of those excavations, emphasizing the stratigraphic components and relative chronology. We conclude that the structure belongs to the Kotosh Religious Tradition (KRT) and can be preliminarily placed in the Late Archaic (2800–1800 BC) or Early Formative period (1800–1200 BC).

Intermediate socio-spatial units (ISUs), materialized as neighborhoods and districts, were important elements in the ordering of the built environment in large ancient settlements. They are indicative of an increasing vertical and horizontal complexity because they lie between households and the governing authority. Collective action theory holds that ISUs can take many forms and can be created through bottom-up, top-down, or top-down/bottom-up processes. The distribution of ISUs in the context of other architectural elements illuminates the degree to which collective policies shaped urban landscapes. This article identifies districts and neighborhoods, two types of ISUs, at the site of Los Guachimontones (Jalisco, Mexico) through a study of its internal spatial organization. Intensive survey and mapping have identified thousands of architectural elements, including the circular complexes known as guachimontones. Thiessen polygon analysis reveals that guachimontones are an important feature of the site's spatial organization, as well as to the materialization of ISUs and other socio-spatial units. Broadly speaking, the organization of these built spaces reveals that their growth can be attributed to collectively oriented political strategies.

Recent survey and excavation conducted in the Mil Plain region of the southern part of the Republic of Azerbaijan challenges traditional notions of Neolithic sedentism. Here, the authors present their findings, and propose that prior to its abandonment towards the end of the sixth millennium BC, the occupation of the region was comprised of numerous highly variable short-term sites and multi-mounded sites (Qarabel Tepe), as well as anchoring sites (Kamiltepe). This indicates multi-scalar patterns of mobility of a much more complex nature than had previously been supposed, making this region quite unique for the Late Neolithic of South-western Asia.

The field of Developmental Origins of Health and Disease (DOHaD) has grown considerably in recent decades and is receiving increasing recognition from health policymakers. Today, DOHaD research aims to offer a comprehensive perspective on health and disease that traces how different life experiences shape health and disease risks over the entire life course. This integrative perspective opens up distinct possibilities for improving health. At the same time, it raises questions regarding the specific social responsibilities of DOHaD as a field and about possible pathways to a socially just and scientifically robust implementation of DOHaD knowledge in society. In this article, we review the history and key characteristics of DOHaD as a field of scientific knowledge production. We argue that based on its key assumptions – that life circumstances, health and disease are closely linked on a molecular scale – DOHaD is an inherently political research field. When tracing how life environments affect health and disease, it is of utmost social and political importance to specify how DOHaD understands and frames these life environments, which aspects of life worlds are included and which excluded, and how research results are interpreted and translated into health recommendations at individual, societal and policy levels. We suggest a number of ways by which the DOHaD community can constructively and responsibly meet the demands that these inherent characteristics place on knowledge production and dissemination in the field.

The presence of exotic materials in funerary contexts in the Sudanese Nile Valley suggests increasing social complexity during the fifth and sixth millennia BC. Amazonite, both in artefact and raw material form, is frequently recovered from Neolithic Sudanese sites, yet its provenance remains unknown. Geochemical analyses of North and East African raw amazonite outcrops and artefacts found at the Neolithic cemetery of R12 in the Sudanese Nile Valley reveals southern Ethiopia as the source of the R12 amazonite. This research, along with data on different exotic materials from contemporaneous Sudanese cemeteries, suggests a previously unknown, long-distance North African exchange network and confirms the emergence of local craft specialisation as part of larger-scale developing social complexity.