Analysis of information sources in references of the Wikipedia article "Servant of the servants of God" in English language version.
[...] the Patriarch of Constantinople began to be addressed as the 'Ecumenical Patriarch', with the first known use of the title being recorded at the time of Patriarch Acacius (472-89).
A Council held in Constantinople in 587 [...] officially bestowed the title 'Ecumenical Patriarch' on Constantinople Patriarch John IV (582-95). This action caused Patriarch of Rome, Pelagius II (579-90) to sever his connection with Constantinople, while his successor, Gregory I (590-604), sent letters of protest to both Patriarch John IV and Emperor Mauricius (582-602) - but with no results.
Pope Pelagius, who in the first instance opposed this assumption of John the faster, having died very shortly afterwards, the quarrel was taken up by his successor Pope Gregory the Great [...]. [...] and in a letter to the bishop of constantinople who succeeded John the faster, he affirms, that 'whoever calls himself Universal Bishop, or desires to be so called in the pride of his heart, is the forerunner of anti-christ.'
