Bede in the context of "Processional cross"

European science in the Middle Ages comprised the study of nature, mathematics and natural philosophy in medieval Europe. Following the fall of the Western Roman Empire and the decline in knowledge of Greek, Christian Western Europe was cut off from an important source of ancient learning. Although a range of Christian clerics and scholars from Isidore and Bede to Jean Buridan and Nicole Oresme maintained the spirit of rational inquiry, Western Europe would see a period of scientific decline during the Early Middle Ages. However, by the time of the High Middle Ages, the region had rallied and was on its way to once more taking the lead in scientific discovery. Scholarship and scientific discoveries of the Late Middle Ages laid the groundwork for the Scientific Revolution of the Early Modern Period.

According to Pierre Duhem, who founded the academic study of medieval science as a critique of the Enlightenment theory of a 17th-century anti-Aristotelian and anticlerical scientific revolution, the various conceptual origins of that alleged revolution lay in the 12th to 14th centuries, in the works of churchmen such as Thomas Aquinas and Buridan.

The Picts were a group of peoples in what is now Scotland north of the Firth of Forth, in the Early Middle Ages. Where they lived and details of their culture can be gleaned from early medieval texts and Pictish stones. The name Picti appears in written records as an exonym from the late third century AD. They are assumed to have been descendants of the Caledonii and other northern Iron Age tribes. Their territory is referred to as "Pictland" by modern historians. Initially made up of several chiefdoms, it came to be dominated by the Pictish kingdom of Fortriu from the seventh century. During this Verturian hegemony, Picti was adopted as an endonym. This lasted around 160 years until the Pictish kingdom merged with that of Dál Riata to form the Kingdom of Alba, ruled by the House of Alpin. The concept of "Pictish kingship" continued for a few decades until it was abandoned during the reign of Caustantín mac Áeda.

Pictish society was typical of many early medieval societies in northern Europe and had parallels with neighbouring groups. Archaeology gives some impression of their culture. Medieval sources report the existence of a Pictish language, and evidence shows that it was an Insular Celtic language related to the Brittonic spoken by the Celtic Britons to the south. Pictish was gradually displaced by Middle Gaelic as part of the wider Gaelicisation from the late ninth century. Much of their history is known from outside sources, including Bede, hagiographies of saints such as that of Columba by Adomnán, and the Irish annals.

The Anglo-Saxons, in some contexts simply called Saxons or the English, were a cultural group who spoke Old English and inhabited much of what is now England and south-eastern Scotland in the Early Middle Ages. They traced their origins to Germanic settlers who became one of the most important cultural groups in Britain by the 5th century. The Anglo-Saxon period in Britain is considered to have started by about 450 and ended in 1066, with the Norman Conquest. Although the details of their early settlement and political development are not clear, by the 8th century an Anglo-Saxon cultural identity which was generally called Englisc had developed out of the interaction of these settlers with the existing Romano-British culture. By 1066, most of the people of what is now England spoke Old English, and were considered English. Viking and Norman invasions changed the politics and culture of England significantly, but the overarching Anglo-Saxon identity evolved and remained dominant even after these major changes. Late Anglo-Saxon political structures and language are the direct predecessors of the high medieval Kingdom of England and the Middle English language. Although the modern English language owes less than 26% of its words to Old English, this includes the vast majority of everyday words.

In the early 8th century, the earliest detailed account of Anglo-Saxon origins was given by Bede (d. 735), suggesting that they were long divided into smaller regional kingdoms, each with differing accounts of their continental origins. As a collective term, the compound term Anglo-Saxon, commonly used by modern historians for the period before 1066, first appears in Bede's time, but it was probably not widely used until modern times. Bede was one of the first writers to prefer "Angles" (or English) as the collective term, and this eventually became dominant. Bede, like other authors, also continued to use the collective term "Saxons", especially when referring to the earliest periods of settlement. Roman and British writers of the 3rd to 6th century described those earliest Saxons as North Sea raiders, and mercenaries. Later sources, such as Bede, believed these early raiders came from the region they called "Old Saxony", in what is now northern Germany, which in their own time had become well known as a region resisting the spread of Christianity and Frankish rule. According to this account, the English (Angle) migrants came from a country between those "Old Saxons" and the Jutes.

The following list of legendary kings of Britain (Welsh: brenin y Brythoniaid or brenin Prydain) derives predominantly from Geoffrey of Monmouth's circa 1136 work Historia Regum Britanniae ("the History of the Kings of Britain"). Geoffrey constructed a largely fictional history for the Britons (ancestors of the Welsh, the Cornish and the Bretons), partly based on the work of earlier medieval historians like Gildas, Nennius and Bede, partly from Welsh genealogies and saints' lives, partly from sources now lost and unidentifiable, and partly from his own imagination (see bibliography). Several of his kings are based on genuine historical figures, but appear in unhistorical narratives. A number of Middle Welsh versions of Geoffrey's Historia exist. All post-date Geoffrey's text, but may give us some insight into any native traditions Geoffrey may have drawn on.

Geoffrey's narrative begins with the exiled Trojan prince Brutus, after whom Britain is supposedly named, a tradition previously recorded in less elaborate form in the 9th century Historia Brittonum. Brutus is a descendant of Aeneas, the legendary Trojan ancestor of the founders of Rome, and his story is evidently related to Roman foundation legends.

Old English literature refers to poetry (alliterative verse) and prose written in Old English in early medieval England, from the 7th century to the decades after the Norman Conquest of 1066, a period often termed Anglo-Saxon England. The 7th-century work Cædmon's Hymn is often considered as the oldest surviving poem in English, as it appears in an 8th-century copy of Bede's text, the Ecclesiastical History of the English People. Poetry written in the mid-12th century represents some of the latest post-Norman examples of Old English. Adherence to the grammatical rules of Old English is largely inconsistent in 12th-century work, and by the 13th century the grammar and syntax of Old English had almost completely deteriorated, giving way to the much larger Middle English corpus of literature.

In descending order of quantity, Old English literature consists of: sermons and saints' lives; biblical translations; translated Latin works of the early Church Fathers; chronicles and narrative history works; laws, wills and other legal works; practical works on grammar, medicine, and geography; and poetry. In all, there are over 400 surviving manuscripts from the period, of which about 189 are considered major. In addition, some Old English text survives on stone structures and ornate objects.

The Chronica sancti Pantaleonis, also called the Annales sancti Panthaleonis Coloniensis maximi, is a medieval Latin universal history written at the Benedictine monastery of Saint Pantaleon in Cologne. It was written in 1237 and covers the history of the world in a series of annals from Creation down to the year of composition. A continuation down to 1249 was added later. Up to the year 1199 it relies heavily on other sources; from 1200 it is an independent source.

The Chronica emphasises the four "great kingdoms" of Daniel (the regna maxima). For ancient history, it relies on Flavius Josephus, Paulus Orosius, Justinus, the Venerable Bede, Regino of Prüm and Petrus Comestor. For more recent events in Germany the annalist used the Chronicon universale of Frutolf von Michelsberg, the chronicle of Ekkehard von Aura and the Chronica regia Coloniensis.