Protohistory

The Iron Age (c. 1200 – c. 550 BC) is the final epoch of the three historical Metal Ages, after the Copper Age and Bronze Age. It has also been considered as the final age of the three-age division starting with prehistory (before recorded history) and progressing to protohistory (before written history). In this usage, it is preceded by the Stone Age (subdivided into the Paleolithic, Mesolithic and Neolithic) and Bronze Age. These concepts originated for describing Iron Age Europe and the ancient Near East. In the archaeology of the Americas, a five-period system is conventionally used instead; indigenous cultures there did not develop an iron economy in the pre-Columbian era, though some did work copper and silver. Indigenous metalworking arrived in Australia with European contact. Although meteoric iron has been used for millennia in many regions, the beginning of the Iron Age is defined locally around the world by archaeological convention when the production of smelted iron (especially steel tools and weapons) replaces their bronze equivalents in common use.

In Anatolia and the Caucasus, or Southeast Europe, the Iron Age began c. 1300 BC. In the ancient Near East, this transition occurred simultaneously with the Late Bronze Age collapse, during the 12th century BC. The technology soon spread throughout the Mediterranean basin region and to South Asia between the 12th and 11th centuries BC. Its further spread to Central Asia, Eastern Europe, and Central Europe was somewhat delayed, and Northern Europe was not reached until c. the 5th century BC.

In Europe, the Iron Age is the last stage of the prehistoric period and the first of the protohistoric periods, which initially meant descriptions of a particular area by Greek and Roman writers. For much of Europe, the period came to an abrupt end after conquest by the Romans, though ironworking remained the dominant technology until recent times. Elsewhere, the period lasted until the early centuries AD, and either Christianization or a new conquest in the Migration Period.Iron working was introduced to Europe in the late 11th century BC, probably from the Caucasus, and slowly spread northwards and westwards over the succeeding 500 years. For example, the Iron Age of Prehistoric Ireland begins around 500 BC, when the Greek Iron Age had already ended, and finishes around 400 AD. The use of iron and iron-working technology became widespread concurrently in Europe and Asia.

The start of the Iron Age is marked by new cultural groupings, or at least terms for them, with the Late Bronze Age Mycenaean Greece collapsing in some confusion, while in Central Europe the Urnfield culture had already given way to the Hallstatt culture. In north Italy the Villanovan culture is regarded as the start of Etruscan civilization. Like its successor La Tène culture, Hallstatt is regarded as Celtic. Further to the east and north, and in Iberia and the Balkans, there are a number of local terms for the early Iron Age culture. Roman Iron Age is a term used in the archaeology of Northern Europe (but not Britain) for the period when the unconquered peoples of the area lived under the influence of the Roman Empire.

The Uruk period (c. 4000/3900 to 3300/3100 BC; also known as Protoliterate period) is a period of the protohistoric Chalcolithic to Early Bronze Age in Mesopotamia and the Ancient Near East. It follows the Ubaid period and precedes the Jemdet Nasr period (although it is often considered a final stage of the Late Uruk period). In the broadest sense, this period coincides with the 4th millennium BC. Uruk culture is also used to refer to the culture originating in Lower Mesopotamia during this period.

Named after the city of Uruk in Southern Mesopotamia, this period saw a set of major innovations that lay the foundations of ancient Mesopotamian civilization. It is the period of the appearance of cities and the State (the so-called "urban revolution"), a phenomenon particularly visible in Lower Mesopotamia, notably on the site of Uruk, where excavations of the monumental center for the levels of the second half of the 4th millennium BC have revealed the existence of this culture. This phenomenon is marked by a greater specialization of activities and functions, which are accompanied by technical innovations: development of irrigated agriculture, appearance of the potter's wheel and of ceramics and bricks of standardized formats produced in large quantities, establishment of sheep farming producing wool, also on a large scale, in textile workshops, etc. The development of state institutions is accompanied by that of management instruments allowing the supervision of workers and other resources, and it is in this context that the first form of writing, 'Proto-cuneiform', appears around 3400-3300, essentially for administrative purposes.

Scotland during the Roman Empire refers to the protohistorical period during which the Roman Empire interacted within the area of modern Scotland. Despite sporadic attempts at conquest and government between the first and fourth centuries AD, most of modern Scotland, inhabited by the Caledonians and the Maeatae, was not incorporated into the Roman Empire with Roman control over the area fluctuating.

In the Roman imperial period, the area of Caledonia lay north of the River Forth, while the area now called England was known as Britannia, the name also given to the Roman province roughly consisting of modern England and Wales and which replaced the earlier Ancient Greek designation as Albion. Roman legions arrived in the territory of modern Scotland around AD 71, having conquered the Celtic Britons of southern Britannia over the preceding three decades. Aiming to complete the Roman conquest of Britannia, the Roman armies under Quintus Petillius Cerialis and Gnaeus Julius Agricola campaigned against the Caledonians in the 70s and 80s. The Agricola, a biography of the Roman governor of Britannia by his son-in-law Tacitus mentions a Roman victory at "Mons Graupius" which became the namesake of the Grampian Mountains but whose identity has been questioned by modern scholarship. In 2023 a lost Roman road built by Julius Agricola was rediscovered in Drip close to Stirling: it has been described as "the most important road in Scottish history".

In the course of his Gallic Wars, Julius Caesar invaded Britain twice: in 55 and 54 BC. On the first occasion, Caesar took with him only two legions, and achieved little beyond a landing on the coast of Kent. The second invasion was more substantial, consisting of 800 ships, five legions and 2,000 cavalry. The force was so imposing that the Celtic Britons did not contest Caesar's landing, waiting instead until he began to move inland. Caesar eventually penetrated into Middlesex and crossed the Thames, forcing the British warlord Cassivellaunus to pay tribute to Rome and setting up Mandubracius of the Trinovantes as a client king. The Romans then returned to Gaul without conquering any territory.

Caesar included accounts of both invasions in his Commentarii de Bello Gallico, which contains the earliest surviving significant eyewitness descriptions of the island's people, culture and geography. This is effectively the start of the written history, or at least the protohistory, of Great Britain.

The Upper Mississippian cultures were located in the Upper Mississippi basin and Great Lakes region of the American Midwest. They were in existence from approximately A.D. 1000 until the Protohistoric and early Historic periods (approximately A.D. 1700).

Archaeologists generally consider "Upper Mississippian" to be an attenuated version of "Middle Mississippian" cultures represented at Cahokia and other sites exhibiting more complex social and political structures, perhaps at a chiefdom level of development. The Middle Mississippians were capable of forming large cities and were thus heavily dependent on agriculture to support large populations. This civilization had its origins about A.D. 1000 or slightly earlier, and was at its peak in the 12th and 13th centuries A.D. when the population at Cahokia was estimated to be 40,000 and the city itself covered an area of 3,480 acres (in contrast, Upper Mississippian sites are usually well under 10 acres). Although the Middle Mississippian declined after its peak, there were still advanced chiefdom-level societies present at the time of the DeSoto expedition in the 1530s and 1540s.