Tracing a journey from the archives of Vienna to those of the Ottoman Empire, this volume unveils the history of the Armenian Catholic Cathedral of the Holy Trinity in Beyoğlu. Founded by the Trinitarian Order and later placed under the protection of the Austrian Empire, the building served for decades as a focal point for Papal representatives. With a prestigious preface by Archbishop Levon Zekiyan, the book captures three centuries of Beyoğlu’s cultural richness, far exceeding expectations. Currently available in the original Turkish edition; English and Italian translations are forthcoming.