Pyramid in the context of Hyperdiffusionist

A civilization (also spelled civilisation in British English) is any complex society characterized by the development of the state, social stratification, urbanization, and symbolic systems of communication beyond signed or spoken languages (namely, writing systems).

Civilizations are organized around densely populated settlements, divided into more or less rigid hierarchical social classes of division of labour, often with a ruling elite and subordinate urban and rural populations, which engage in intensive agriculture, mining, small-scale manufacture and trade. Civilization concentrates power, extending human control over the rest of nature, including over other human beings. Civilizations are characterized by elaborate agriculture, architecture, infrastructure, technological advancement, currency, taxation, regulation, and specialization of labour.

The Fourth Dynasty of ancient Egypt (notated Dynasty IV) is characterized as a "golden age" of the Old Kingdom of Egypt. Dynasty IV lasted from c. 2613 to c. 2498 BC. It was a time of peace and prosperity as well as one during which trade with other countries is officially documented.

The Fourth Dynasty heralded the height of the pyramid-building age. The peaceful rule of the Third Dynasty allowed artistic expressions to flourish. Building experiments done by King Sneferu led to the evolution of mastaba tombs into the smooth-sided pyramids like those seen on the Giza Plateau. No other period in Egyptian history equaled the accomplishments achieved during the Fourth Dynasty.

In ancient Egyptian history, the Old Kingdom is the period spanning c. 2700–2200 BC. It is also known as the "Age of the Pyramids" or the "Age of the Pyramid Builders", as it encompasses the reigns of the great pyramid-builders of the Fourth Dynasty, such as King Sneferu, under whom the art of pyramid-building was perfected, and the kings Khufu, Khafre and Menkaure, who commissioned the construction of the pyramids at Giza. Egypt attained its first sustained peak of civilization during the Old Kingdom, the first of three so-called "Kingdom" periods (followed by the Middle Kingdom and New Kingdom), which mark the high points of civilization in the lower Nile Valley.

The concept of an "Old Kingdom" as one of three "golden ages" was coined in 1845 by the German Egyptologist Baron von Bunsen, and its definition evolved significantly throughout the 19th and the 20th centuries. Not only was the last king of the Early Dynastic Period related to the first two kings of the Old Kingdom, but the "capital", the royal residence, remained at Ineb-Hedj, the Egyptian name for Memphis. The basic justification for separating the two periods is the revolutionary change in architecture accompanied by the effects on Egyptian society and the economy of large-scale building projects.

Giza (/ˈɡiːzə/; sometimes spelled Gizah, Gizeh, Geeza, Jiza; Arabic: الجيزة, romanized: al-Jīzah, pronounced [ald͡ʒiːzah], Egyptian Arabic: الجيزة el-Gīza [elˈgiːzæ]) is the third-largest city in Egypt by area after Cairo and Alexandria; and sixteenth-largest city in Africa by population. It is the capital of Giza Governorate with a total population of 4,458,135 as of 2023. It is located on the west bank of the Nile opposite central Cairo, and is a part of the Greater Cairo metropolis. Giza lies less than 30 kilometres (20 miles) north of Memphis (Men-nefer, today the village of Mit Rahina), which was the capital city of the unified Egyptian state during the reign of pharaoh Narmer, roughly 3100 BC.

Giza is most famous as the location of the Giza Plateau, the site of some of the most impressive ancient monuments in the world, including a complex of ancient Egyptian royal mortuary and sacred structures, among which are the Great Sphinx, the Great Pyramid of Giza, and a number of other large pyramids and temples and the Grand Egyptian Museum. Giza has always been a focal point in Egypt's history due to its location close to Memphis, the ancient pharaonic capital of the Old Kingdom.

30°01′55″N 31°04′30″E / 30.03194°N 31.07500°E / 30.03194; 31.07500

Abu Rawash (also spelled Abu Roach, Abu Roash; Arabic: ابو رواش  Egyptian Arabic pronunciation: [ˈæbu ɾæˈwæːʃ], Coptic: ⲁⲃⲣⲱⲟⲩϣⲓ abrowshi, Coptic pronunciation: [ɑbˈroːwʃi], "flesh of sensual pleasures"), 8 kilometres (5.0 mi) north of Giza, is the site of Egypt's most northerly pyramid, also known as the lost pyramid – the mostly ruined Pyramid of Djedefre, the son and successor of Khufu. Originally, it was thought that this pyramid had never been completed, but the current archaeological consensus is that not only was it completed, but that it was built about the same size as the Pyramid of Menkaure – the third largest of the Giza pyramids. It's believed that the destruction of the pyramid started at the end of the New Kingdom at the latest, and was particularly intense during the Roman and early Christian eras when a Coptic monastery was built in nearby Wadi Karin. It has been proven, moreover, that at the end of the nineteenth century, stone was still being hauled away at the rate of three hundred camel loads a day.

Zawyet El Aryan (زاویة العریان) is a town in the Giza Governorate of Egypt, located between Giza and Abusir. To the west of the town, just in the desert area, is a necropolis, referred to by the same name. Almost directly east across the Nile is Memphis. In Zawyet El Aryan, there are two pyramid complexes and five mastaba cemeteries.

Meidum, Maydum or Maidum (Arabic: ميدوم, Ancient Egyptian: Mr(y)-Jtmw, lit. 'beloved of Atum', Ancient Greek: Μοι(ε)θυμις) is an archaeological site in Lower Egypt. It contains a large pyramid and several mudbrick mastabas. The pyramid was Egypt's first straight-sided one, but it partially collapsed in ancient times. The area is located around 72 kilometres (45 mi) south of modern Cairo.

Engineering is the practice of using natural science, mathematics, and the engineering design process to solve problems within technology, increase efficiency and productivity, and improve systems. The traditional disciplines of engineering are civil, mechanical, electrical, and chemical. The academic discipline of engineering encompasses a broad range of more specialized subfields, and each can have a more specific emphasis for applications of mathematics and science. In turn, modern engineering practice spans multiple fields of engineering, which include designing and improving infrastructure, machinery, vehicles, electronics, materials, and energy systems. For related terms, see glossary of engineering.

As a human endeavor, engineering has existed since ancient times, starting with the six classic simple machines. Examples of large-scale engineering projects from antiquity include impressive structures like the pyramids, elegant temples such as the Parthenon, and water conveyances like hulled watercraft, canals, and the Roman aqueduct. Early machines were powered by humans and animals, then later by wind. Machines of war were invented for siegecraft. In Europe, the scientific and industrial revolutions advanced engineering into a scientific profession and resulted in continuing technological improvements. The steam engine provided much greater power than animals, leading to mechanical propulsion for ships and railways. Further scientific advances resulted in the application of engineering to electrical, chemical, and aerospace requirements, plus the use of new materials for greater efficiencies.

An obelisk (/ˈɒbəlɪsk/; from Ancient Greek ὀβελίσκος (obelískos), diminutive of ὀβελός (obelós) ' spit, nail, pointed pillar') is a tall, slender, tapered monument with four sides and a pyramidal or pyramidion top. Originally constructed by Ancient Egyptians and called tekhenu, the Greeks used the Greek term obeliskos to describe them, and this word passed into Latin and ultimately English. Though William Thomas used the term correctly in his Historie of Italie of 1549, by the late sixteenth century (after reduced contact with Italy following the excommunication of Queen Elizabeth), Shakespeare failed to distinguish between pyramids and obelisks in his plays and sonnets. Ancient obelisks are monolithic and consist of a single stone; most modern obelisks are made of several stones.

A population pyramid (age structure diagram) or "age-sex pyramid" is a graphical illustration of the distribution of a population (typically that of a country or region of the world) by age groups and sex; it typically takes the shape of a pyramid when the population is growing. Males are usually shown on the left and females on the right, and they may be measured in absolute numbers or as a percentage of the total population. The pyramid can be used to visualize the age of a particular population. It is also used in ecology to determine the overall age distribution of a population; an indication of the reproductive capabilities and likelihood of the continuation of a species. Number of people per unit area of land is called population density.

An overlord in the English feudal system was a lord of a manor who had subinfeudated a particular manor, estate or fee, to a tenant. The tenant thenceforth owed to the overlord one of a variety of services, usually military service or serjeanty, depending on which form of tenure (i.e. feudal tenancy contract) the estate was held under. The highest overlord of all, or lord paramount, was the monarch, who due to his ancestor William the Conqueror's personal conquest of the Kingdom of England, owned by inheritance from him all the land in England under allodial title and had no superior overlord, "holding from God and his sword", although certain monarchs, notably King John (1199–1216) purported to grant the Kingdom of England to Pope Innocent III, who would thus have become overlord to English monarchs.

A paramount lord may then be seen to occupy the apex of the feudal pyramid, or the root of the feudal tree, and such allodial title is also termed "radical title" (from Latin radix, root), "ultimate title" and "final title". William the Conqueror immediately set about granting tenancies on his newly won lands, in accordance with feudal principles. The monarch's immediate tenants were the tenants-in-chief, usually military magnates, who held the highest status in feudal society below the monarch. The tenants-in-chief usually held multiple manors or other estates from the monarch, often as feudal barons (or "barons by tenure") who owed their royal overlord an enhanced and onerous form of military service, and subinfeudated most to tenants, generally their own knights or military followers, keeping only a few in demesne. This created a mesne lord – tenant relationship. The knights in turn subinfeudated to their own tenants, creating a further subsidiary mesne lord – tenant relationship. Over the centuries for any single estate the process was in practice repeated numerous times.

The Egyptian pyramids are ancient masonry structures located in Egypt. Most were built as tombs for the pharaohs and their consorts during the Old and Middle Kingdom periods. At least 138 identified pyramids have been discovered in Egypt. Approximately 80 pyramids were built within the Kingdom of Kush, now located in the modern country of Sudan.

The earliest known Egyptian pyramids are at Saqqara, west of Memphis. Step-pyramid-like structures, like Mastaba 3808 attributed to pharaoh Anedjib, may predate the Pyramid of Djoser built c. 2630–2610 BCE during the Third Dynasty. This pyramid and its surrounding complex are generally considered to be the world's oldest monumental structures constructed of dressed masonry.