Isidor of Seville is the most important person in the area of etymology between the Antique Period and the Middle Ages. He was born in the 6th century, but almost nothing is known about his life; only a few historical data are available. The Bishop had an important role in the Spanish political and religious life, and after the death of his brother Leander of Seville he succeeded the bishop's throne in Seville. By analysing his master-piece, Etymologies, which was very influential for the cultural life in the Middle Ages, it can be seen how he drove the church closer to the people. This work is of an encyclopaedic character. It is divided into twenty books, including all the knowledge of the time, and since religion represented everything to Isidore, it unites religion with etymologies using the Bible as its base. In such a way he wanted to bring Christianity closer to people and strengthen their connection to God. Isidore of Seville did not only lead to the Spanish cultural revival at the time of the Visigoths’ rule, between the 6th and the 7th centuries, but also to a change in the view of the world indicating the transition from the Antique Period to the Middle Ages.