Prof. Dr. Alberto Cantera (Freie Universität Berlin) will deliver the 9th Ratanbai Katrak Lectures on Zoroastrianism in Spring (Trinity Term) and Autumn (Michaelmas Term) of 2023. These six lectures will represent the 101st anniversary of their establishment at the University of Oxford in 1922 by Dr. Nanabhai Navroji Katrak in memory of his deceased wife, Ratanbai Katrak. Provision was made for the University of Oxford to invite a distinguished scholar to deliver a series of six public lectures in the English language on some subject connected with the study of the religion of Zoroaster. The purpose of the Lecturership is to promote the study of the religion of Zoroaster and of its later developments from a theological, philological, and historical point of view. Illustrious scholars of the study of Zoroastrianism in the 20th century such as Louis H. Gray (Columbia University), Sir Harold W. Bailey (Cambridge University), Walter B. Henning (SOAS, UC Berkeley), Ilya Gershevitch (Cambridge University), Mary Boyce (SOAS), John Hinnells (University of Manchester), and Philippe Gignoux (EPHE, Paris) have been the Ratanbai Katrak Lecturer.