Dadishoʻ I was bishop of Seleucia-Ctesiphon and head of the Church of the East (he is often called the “first catholicos” [Catholicos], though that title and the use of the term “patriarch” seem to arise later). Nothing of Dadishoʻ’s theological positions or of what he thought of the controversies around Nestorius (Nestorianism/Nestorius) is known. His only writings, commentaries on some Old Testament books that seem to have been uncontroversial, are lost. Dadishoʻ is known only through the controversies…