09 Religions and Philosophies of the Ancient World

Traditions and historical change

Religious and philosophical traditions across Eurasia offered ways to understand the cosmos, live ethically, organize communities, and respond to suffering and death. They developed in particular historical settings and changed over time, with migration, trade, conquest, and debate contributing to their spread and interaction.

The boundary between religion and philosophy was not always sharp. Confucianism, for example, guided government and social ethics, while Greek philosophical schools considered both reason and the good life.

Judaism, law, and community

Judaism developed among the ancient Israelites of the eastern Mediterranean. Its foundational stories describe a Covenant between God and the people of Israel, and its sacred writings include the Torah and other books of the Hebrew Bible. Israelite religion took shape amid ancient Near Eastern cultures; biblical texts and external evidence both inform its history, but do not always present the same picture.

Political upheavals changed Jewish religious life. After Babylon conquered Judah and destroyed Jerusalem’s First Temple in 586 BCE, many Judeans were exiled. Under Persian rule, some returned and the Jerusalem Temple was rebuilt. The Temple again became a central institution, while Jewish communities also lived across the wider region.

After Rome destroyed the Second Temple in 70 CE, religious life increasingly centered on Torah study, prayer, synagogues, and teachers. Rabbinic scholars developed Jewish law and interpretation in works including the Mishnah and the Talmuds. These helped Jewish communities sustain practice both in the land of Israel and in the Diaspora.

Christianity in the Roman world

Christianity began in the first century CE as a Jewish movement centered on Jesus of Nazareth. Christians came to understand Jesus as the Messiah and, in Christian belief, as the Son of God; his followers proclaimed his resurrection. The apostle Paul and other missionaries carried the movement beyond Jewish communities to non-Jewish audiences around the Mediterranean.

Christian communities formed churches, developed shared scriptures and teachings, and debated belief and authority. Christianity spread within the Roman Empire, at times despite persecution. In the fourth century, Constantine favored Christianity, and by the end of that century it had become the empire’s official religion. Church councils helped define influential doctrines, and monastic communities became important centers of religious life and learning.

Over subsequent centuries, Latin-speaking western and Greek-speaking eastern Christian traditions developed distinct institutions. In the sixteenth century, the Protestant Reformation created further divisions in western Christianity and reshaped religious and political life in Europe.

Islam and the Muslim community

Islam arose in seventh-century Arabia. Muslims believe that God, called Allah in Arabic, revealed the Qur’an to Muhammad in Mecca and Medina; Muslims regard Muhammad as God’s prophet. His migration, or Hijra, from Mecca to Medina in 622 CE marks the beginning of the Islamic calendar. In Medina, a community of believers formed around worship of one God and practices that include prayer, charity, fasting, and pilgrimage. The Qur’an is Islam’s central scripture, and reports about Muhammad’s words and example also became important sources for Muslim life and law.

After Muhammad’s death in 632, Muslims disagreed over leadership of the community. This historical succession dispute contributed to the development of Sunni and Shi‘i traditions, each of which contains diverse schools and communities. Early caliphates extended Muslim political rule across a vast territory, but conversion occurred gradually and unevenly.

Under the Abbasids, Baghdad became a major center of scholarship. Muslim, Christian, and Jewish scholars worked there within a wider exchange of Greek, Persian, and Indian learning. Trade and scholarship also carried Islam across Africa, Central Asia, and South and Southeast Asia.

South Asian paths and liberation

South Asia produced several influential traditions with overlapping concepts but different teachings. Vedic texts and later works such as the Upanishads contributed to the varied traditions now grouped under Hinduism. Many Hindu schools discuss dharma, or duty or right order; karma, or the consequences of action; samsara, or rebirth; and moksha, or liberation.

Hindu practice has never been a single uniform system. It includes diverse philosophies, devotional traditions, deities, rituals, and approaches to spiritual life.

Buddhism and Jainism emerged in the first millennium BCE amid debates about ritual, authority, and liberation. Siddhartha Gautama, the Buddha, taught a path addressing suffering and its causes, cultivated through ethical conduct, meditation, and insight. Jainism, associated with Mahavira, emphasizes nonviolence and spiritual discipline. Both traditions developed monastic communities and spread beyond India; Buddhist institutions and teachings traveled along trade routes into Central, East, and Southeast Asia.

Buddhism, Jainism, and Hindu traditions share ideas such as karma and rebirth, but differ substantially in their accounts of the self, spiritual practice, and liberation.

China and the Iranian world

In China, Confucius (551–479 BCE) taught that moral cultivation, respect within relationships, and responsible government could sustain social order. Confucian ideas later became influential in state institutions and education.

Daoist thought, associated with texts such as the Daodejing, emphasized the Dao, the “Way” underlying the world, and ideals including simplicity and wu wei: action that does not force matters against their natural course. Confucianism and Daoism were not always exclusive alternatives. People and governments could draw on Confucian, Daoist, Buddhist, and local practices in different settings. Buddhism reached China from South Asia and developed influential Chinese forms.

Zoroastrianism is an ancient Iranian religion associated with the prophet Zarathustra. It teaches devotion to Ahura Mazda and emphasizes moral choice between truth and falsehood. The religion was influential under several Persian empires. Its long interaction with neighboring religious communities forms part of the region’s history, though scholars debate the extent and direction of particular influences on other traditions.

Greek philosophy and the good life

Greek philosophers offered influential accounts of knowledge, nature, politics, and ethics. Socrates made questioning and examination central to philosophical inquiry. Plato explored justice and the nature of reality, while Aristotle investigated subjects ranging from logic and biology to government and ethics.

Later Hellenistic schools proposed different paths to a flourishing life. Stoicism emphasized virtue and living in accordance with reason; Epicureanism valued freedom from fear and disturbance. Greek ideas later entered Jewish, Christian, and Muslim philosophical discussions, often through translation and commentary.

Living traditions and later developments

Religious life continued to change in the early modern era. In northern India, Guru Nanak founded Sikhism in the late fifteenth century, teaching devotion to one God and establishing a community whose scripture and institutions developed under successive Sikh Gurus. In Europe, the Protestant Reformation challenged existing church authority and produced new Christian traditions.

These developments, alongside the histories of Judaism, Christianity, Islam, and traditions across South Asia, China, Iran, and Greece, illustrate how political change and long-distance exchange helped religions and philosophies spread and evolve. Their histories include internal diversity, debate, adaptation, and sustained interaction.