On 16 October 2025, Prof. Dr Andrea Riedl gave a lecture in Peristeri/Athens entitled "What happened in 1204?". The event took place as part of the annual conference of the International Irenaeus Working Group of Catholic and Orthodox theologians at the invitation of Metropolitan Prof Dr Grigorios Papathomas.

Find out more about the Irenaeus Working Grouphere (external link, opens in a new window).

The communiqué of this year's conference can be found here (opens in a new window). (This PDF is not accessible).