Who was St. Irenaeus of Lyons?

As Marcus Grodi and Msgr. Jeffrey Steenson begin a series on St. Irenaeus and his work Against Heresies, they start by taking a look at the state of Christianity in the 2nd century, and how the teaching of the apostles and their successors is articulated in the writings of St. Irenaeus.

They discuss the importance of St. Irenaeus as an early Church Father, and why his work has remained a classic text for anyone who wants to know more about Christianity in its earliest years.

The full text of Against Heresies is available at NewAdvent.