The monastery of Rabban Hormizd in Iraq is an important site in the history of the Assyrian Church of the East and Chaldean Catholic Church. In the present article, Arthur Vaschalde presents a brief survey and partial translation of a manuscript from the personal collection of Henri Hyvernat that describes the monastery and some of the monks who have occupied it. The text of the manuscript is split into two parts: Part I contains historical information about the foundation of the monastery, and Part II describes life at the monastery in the first half of the nineteenth-century. The text of Part I was previously published by J. B. Chabot, but the present work is based on a different manuscript than the one used by Chabot.