http://www.vaticanstate.va/content/vaticanstate/en/monumenti/basilica-di-s-pietro.html
According to this website, the dome of St. Peter's Basilica is the basis for other domes in the western world. I agree with the author because the Roman's were the first to build large scale structures with Domes. Therefor it is highly likely that other architects would copy a famous dome, aka the dome of St. Peter's Basilica.