Aristotle was a Greek philosopher and polymath who lived from 384 to 322 BC.

Augustine of Hippo, also known as Saint Augustine, was a prominent theologian and philosopher from the Roman province of Africa.

The Cappadocian Fathers, also traditionally known as the Three Cappadocians, were a trio of Byzantine Christian prelates, theologians and monks who helped shape both early Christianity and the monastic tradition.

Eastern Christianity refers collectively to the Christian traditions that developed in the Eastern part of the Roman Empire and later spread throughout Eastern Europe, the Middle East, and Africa.

Epistemology is the branch of philosophy that explores the nature, origins and limits of knowledge.

The First Council of Nicaea was a gathering of bishops from the early Christian Church that took place in the city of Nicaea (modern-day Iznik, Turkey) in 325 AD.

Infinity is a concept that signifies an endless or limitless quantity, time, or space.

Kyiv is the capital and largest city of Ukraine, located in the north-central part of the country along the Dnieper River.