He apologised to Jews for Catholic passivity during the Holocaust, prayed at a Syrian mosque and took steps to heal the rift between Catholics and adherents of the various easternOrthodoxchurches.
Their Church split from the EasternOrthodox and Roman Catholic Churches in 451AD because of a theological dispute over the nature of Christ but is now, on most issues, doctrinally similar to the EasternOrthodox Church.