Further proof comes from fourth - century church historian Eusebius. In his book The History of the Church From Christ to Constantine, he quotes a certain Quadratus who sent a letter to the emperor in defense of Christianity.
चौथी - सदी का चर्च - इतिहासकार, यूसेबियस अतिरिक्‍त प्रमाण प्रस्तुत करता है ।