St. Hilary of Poitiers is often referred to by which title due to his influence during the Arian controversy?

St. Hilary of Poitiers is referred to as "Athanasius of the West" due to his significant role in the Arian controversy, which centered around the nature of Christ and his relationship to the Father. This title acknowledges his steadfast defense of Nicene Christianity against Arianism, much like St. Athanasius of Alexandria did in the East. Hilary's theological writings and his insistence on the divinity of Christ were pivotal in strengthening the orthodox position within the Western Church during this critical period of theological conflict.

His commitment to the Nicene Creed and his articulate opposition to Arian views earned him this distinctive title, signifying not only his geographical context but also his theological alignment with Athanasius and the broader fight against heretical teachings on the nature of Christ. The other designations do not capture the essence of his contributions as precisely as "Athanasius of the West."