The paper discusses the two books of Rufinusʼ supplement to the History of the Church by Eusebius in the framework of their bridge building role between Churches in the East and West of the Roman Empire. The author stresses Rufinusʼ presentation of some crucial personalities and phenomena of the Eastern Christiany to a Westerns readership. Unlike the critical Jerome and Orosius he preserved a much more ʺcanonicalʺ Eastern depiction of the Emperor Constantine in his work. Furthermore , Athanasius and Basil of Ceasarea are placed to the centre of his depiction of the struggle against Arianism whereas his focal points shifts towards West only towards the end of the second book with Ambrose and Theodosius the Great. His work in this area proved to be very important for Christian East and West were parted during his youth on many levels for the first time due to the Arian crisis. In this sensitive period Rufinus succeeded in his presenting of some bright examples of the Church from the East to his Western readership. Many scenes from his History of the Church had preserved a firm place in the Western knowledge about the Ancient Christianity.