This paper offers a comparative analysis of the theological ideas of Eustatius of Antioch and Marcellus of Ancyra on the divine generation of the Son from the Father. The central insight is that their theological opinions were not heavily divergent, but that historical circumstances played a crucial role in determining the perception of their doctrines. Eustatius of Antioch, prematurely exiled, did not have the opportunity to defend and further develop his ideas in the context of the Arian controversies. Marcellus of Ancyra, on the other hand, continued to be active during a period of doctrinal evolution, which led him to be labeled as heretic. This paper examines texts and historical evidence to show how historical fortunes and political dynamics influenced the reception of theologies and shaped the perception of doctrines. The goal is to highlight that the doctrine evolves in pair with a complex number of elements, including self representation of a theological cluster, facing historical, political and geoecclesiasical events.