Comparative mythology is the comparison of myths from different cultures in an attempt to identify shared themes and characteristics.Littleton, p. 32 Comparative mythology has served a variety of academic purposes. For example, scholars have used the relationships between different myths to trace the development of religions and cultures, to propose common origins for myths from different cultures, and to support various psychoanalytical theories.

The comparative study of mythologies reveals the trans-national motifs that unify spiritual understanding globally. The significance of this study generates a "broad, sympathetic understanding of these 'stories' in human history". The similarities of myths remind humanity of the universality in the human experience.

Background Anthropologist C. Scott Littleton defined comparative mythology as "the systematic comparison of myths and mythic themes drawn from a wide variety of cultures". By comparing different cultures' mythologies, scholars try to identify underlying similarities and/or to reconstruct a "protomythology" from which those mythologies developed. To an extent, all theories about mythology follow a comparative approach—as scholar of religion Robert Segal notes, "by definition, all theorists seek similarities among myths".Segal, "The Romantic Appeal of Joseph Campbell" However, scholars of mythology can be roughly divided into particularists, who emphasize the differences between myths, and comparativists, who emphasize the similarities. Particularists tend to "maintain that the similarities deciphered by comparativists are vague and superficial", while comparativists tend to "contend that the differences etched by particularists are trivial and incidental".Segal, Theorizing About Myth, p. 148

Comparative approaches to mythology held great popularity among eighteenth- and nineteenth-century scholars. Many of these scholars believed that all myths showed signs of having evolved from a thought which interpreted nearly all myths as poetic descriptions of the sun's behavior. According to this theory, these poetic descriptions had become distorted over time into seemingly diverse stories about gods and heroes.Leonard However, modern-day scholars lean more toward particularism, feeling suspicious of broad statements about myths.Northup, p. 8 A recent exception is the historical approach followed in E.J. Michael Witzel's reconstruction of many subsequent layers of older myths.E.J.M. Witzel, "The Origins of the World's Mythologies, New York : OUP 2012

Approaches Comparative mythologists come from various fields, including folklore, literature, history, linguistics, and religious studies, and they have used a variety of methods to compare myths.

Linguistic

Some scholars look at the linguistic relationships between the myths of different cultures. For example, the similarities between the names of gods in different cultures. One particularly successful example of this approach is the study of Indo-European mythology. Scholars have found striking similarities between the mythological and religious terms used in different cultures of Europe and India. For example, the Greek sky-god Zeus Pater, the Roman sky-god Jupiter, and the Indian (Vedic) sky-god Dyauṣ Pitṛ have linguistically identical names.

This suggests that the Greeks, Romans, and Indians originated from a common ancestral culture, and that the names Zeus, Jupiter, Dyaus and the Germanic Tiu (cf. English Tues-day) evolved from an older name, *Dyēus ph2ter, which referred to the sky-god or, to give an English cognate, the divine father in a Proto-Indo-European religion.Watkins 47–48 An approach which is both historical and comparative was recently proposed by E.J. Michael Witzel. He compares collections of mythologies and reconstructs increasingly older levels, parallel to but not necessarily dependent on language families. The most prominent common feature is a storyline that extends from the creation of the world and of humans to their end. This feature is found in the northern mythologies of Eurasia and the Americas ("Laurasia") while it is missing in the southern mythologies of Subsaharan Africa, New Guinea and Australia ("Gondwanaland").

Mythological phylogenies also are a potentially powerful way to test hypotheses about cross-cultural relationships among folktales.Ross and al. 2013; Tehrani 2013.

Structural

Some scholars look for underlying structures shared by different myths. The folklorist Vladimir Propp proposed that many Russian fairy tales have a common plot structure, in which certain events happen in a predictable order.Propp, passim In contrast, the anthropologist Claude Lévi-Strauss examined the structure of a myth in terms of the abstract relationships between its elements, rather than their order in the plot. In particular, Lévi-Strauss believed that the elements of a myth could be organized into binary oppositions (raw vs. cooked, nature vs. culture, etc.). He thought that the myth's purpose was to "mediate" these oppositions, thereby resolving basic tensions or contradictions found in human life or culture.Lévi-Strauss, p. 224

Psychoanalysis

Some scholars propose that myths from different cultures reveal the same, or similar, psychoanalytic forces at work in those cultures. Some Freudian thinkers have identified stories similar to the Greek story of Oedipus in many different cultures. They argue that these stories reflect the different expressions of the Oedipus complex in those cultures.Johnson and Price-Williams, passim Likewise, Jungians have identified images, themes, and patterns that appear in the myths of many different cultures. They believe that these similarities result from archetypes present in the unconscious levels of every person's mind.Graves, p. 251

Motifs

Creation of the earthly realm

A creation myth (or cosmogonic myth) is a symbolic narrative of how the world began and how people first came to inhabit it. While in popular usage the term myth often refers to false or fanciful stories, members of cultures often ascribe varying degrees of truth to their creation myths. In the society in which it is told, a creation myth is usually regarded as conveying profound truths – metaphorically, symbolically, historically, or literally. They are commonly, although not always, considered cosmogonical myths – that is, they describe the ordering of the cosmos from a state of chaos or amorphousness.

Creation myths often share a number of features. They often are considered sacred accounts and can be found in nearly all known religious traditions. They are all stories with a plot and characters who are either deities, human-like figures, or animals, who often speak and transform easily. They are often set in a dim and nonspecific past that historian of religion Mircea Eliade termed in illo tempore ('at that time'). Creation myths address questions deeply meaningful to the society that shares them, revealing their central worldview and the framework for the self-identity of the culture and individual in a universal context.

Creation myths develop in oral traditions and therefore typically have multiple versions; found throughout human culture, they are the most common form of myth.

Omne Vivum ex Ovo (Cosmic Egg)

The cosmic egg is a mythological motif found in the cosmogonies of many cultures and civilizations, including in Proto-Indo-European mythology. Typically, there is an egg which, upon "hatching", either gives rise to the universe itself or gives rise to a primordial being who, in turn, creates the universe. The egg is sometimes lain on the primordial waters of the Earth. Typically, the upper half of the egg, or its outer shell, becomes the heaven (firmament) and the lower half, or the inner yolk, becomes the Earth. The motif likely stems from simple elements of an egg, including its ability to offer nourishment and give rise to new life, as is reflected by the Latin proverb omne vivum ex ovo ('all life comes from an egg').

Primordial Chaos

Chaos (Ancient Greek: χάος, romanized: kháos) (aka Primordial Chaos, Primordial Void) is the mythological void state preceding the creation of the universe (the cosmos) in Greek creation myths. In Christian theology, the same term is used to refer to the gap or the abyss created by the separation of heaven and earth. In Norse mythology, Ginnungagap (old Norse: [ˈɡinːoŋɡɑˌɡɑp]; "gaping abyss", "yawning void") is the primordial void mentioned in the Gylfaginning, the Eddaic text recording Norse cosmogony. In Chinese mythology, the state of existence before the creation of the universe is often referred to as Hundun (混沌), which translates to "primordial chaos" - essentially a formless, undifferentiated state where everything was mixed together before the creation deity, Pangu, separated heaven and earth.

Creation of mankind from clay

The creation of man from clay is a theme that recurs throughout numerous world religions and mythologies.

In the Epic of Gilgamesh, Enkidu is created by the goddess Aruru out of clay. In Greek mythology, Prometheus molded men out of water and earth. Per the Hebrew Bible, (Genesis 2:7) "And the Lord God formed man of the dust of the ground, and breathed into his nostrils the breath of life; and man became a living soul". In Hindu mythology, the mother of Ganesh, Parvati, made Ganesh from her skin. In Chinese mythology (see Chu Ci and Imperial Readings of the Taiping Era), Nüwa molded figures from the yellow earth, giving them life and the ability to bear children.

First Humans

A protoplast, from ancient Greek πρωτόπλαστος (prōtóplastos, "first-formed"), in a religious context initially referred to the first human or, more generally, to the first organized body of progenitors of mankind in a creation myth.

Numerous examples exist throughout history of a human couple being the progenitors of the entire human species. This would include, but not limited to Adam and Eve of Abrahamism, Ask and Embla of Norse mythology, and Fuxi and Nüwa from Chinese mythos.

In Hindu mythology, Manu refers to the archetypal man. In Sanskrit the term for 'human', मानव (IAST: mānava) means 'of Manu' or 'children of Manu'. The Manusmriti is an ancient legal text and constitution among the many Dharmaśāstras of Hinduism and is believed to be a discourse given by Manu.

Acquisition of fire for the benefit of humanity

The theft of fire for the benefit of humanity is a theme that recurs in many world mythologies. A few examples include: in Greek mythology, according to Hesiod, the Titan Prometheus steals the heavenly fire for humanity, enabling the progress of civilization. In the Book of Enoch, the fallen angels and Azazel teach early humanity use of tools and fire. Per the ancient Indian collection of Vedic Sanskrit hymns, the Rigveda (3:9.5), speaks of a hero Mātariśvan who recovered fire which had been hidden from humanity.

Flood myth

Cultures around the world tell stories about a great flood.Segal, untitled, p. 88 In many cases, the flood leaves only one survivor or group of survivors. For example, both the Babylonian Epic of Gilgamesh and the Hebrew Bible tell of a global flood that wiped out humanity and of a man who saved the Earth's species by taking them aboard a boat.Woolley, p. 52 Similar stories of a single flood survivor appear in Hindu mythology where Manu saves the Earth from the deluge by building an arkDimmitt and van Buitenen, pp. 71–74 as well as Greek, Norse mythology, Inca mythology and Aztec mythology.Urton, p. 36 The flood narratives, spanning across different traditions such as Mesopotamian, Hebrew, Islamic, and Hindu, reveal striking similarities in their core elements, including divine warnings, ark construction, and the preservation of righteousness, highlighting the universal themes that thread through diverse religious beliefs.

Dying god