And I was almost forgetting Theodore the Studite; he was about as Eastern as it gets
From here https://catholiclibrary.org/library/view?docId=Fathers-Synchronized-EN/Theodorus_Studita__Epistulae.en.html;chunk.id=00000351 we can read the incipit of his letter to Pope Paschal I
“271” To Paschal, Pope of Rome}1 “To the all-holy in all things, great luminary, first high priest, our lord, master, apostolic pope, John, Theodosios, Athanasios, John, Theodore, the least presbyters and hegumens of Kathara, of Pikridion, of Paulopetrion, of Eukairia, of Stoudios. Surely by now your supreme blessedness has heard of the things which, on account of our sins, have come upon our church (for we have become a proverb and a tale among all the nations, to speak scripturally), but perhaps the report was not complete and by letter. Wherefore we, the least, although being perchance the last member of the body of Christ, nevertheless, since our head is restrained and the leaders in the brotherhood are scattered here and there, have been able in some way, being near and through mutual communication, to become one in spirit and in word, writing these things, even if boldly. Hear, apostolic head, God-appointed shepherd of Christ’s”
And on the next page he writes (I am only quoting excerpts, since the full text would be too long)https://catholiclibrary.org/library/view?docId=Fathers-Synchronized-EN/Theodorus_Studita__Epistulae.en.html;chunk.id=00000353
“Come then from the West, O imitator of Christ, arise and do not cast us off forever; to you Christ our God has said, “and when you have turned again, strengthen your brethren.” Behold the time and the place; help us, you who have been appointed by God for this, stretch out a hand as far as it is possible; you have the power from God FROM BEING FIRST AMONG ALL, in which position you were also placed. Terrify, we pray, the heretical beasts with the pipe of your divine word; O good shepherd, lay down your life for the sheep of Christ, we beseech you.”
And also from the same page
“The dayspring from on high has visited us, Christ our God, having set your Blessedness in the West like some divinely-shining lamp for the illumination of the church under heaven upon the first apostolic throne. For we, who were held in darkness and the shadow of death by the wicked heresy, perceived the intelligible light, and we cast off the cloud of despondency and looked up to good hopes, having learned from our brothers and fellow servants whom we sent what great things your holy Eminence has both done and said, how you did not even admit the heretical apocrisiaries to your sacred presence, as if they were robbers, but justly sent them away while they were still far off, and how, imitating God, you were saddened and groaned over our afflictions upon hearing the letters and the account of those who were sent, as if over your own members. And truly we, the humble, recognized that a true successor of the chief of the apostles presides over the Roman church; truly we are convinced that the Lord has not completely forsaken our church, since the one and only assistance from you has been available to it from above and from the beginning in the present circumstances by the providence of God. You therefore are truly (then we have to go to the next page https://catholiclibrary.org/library/view?docId=Fathers-Synchronized-EN/Theodorus_Studita__Epistulae.en.html;chunk.id=00000355 )the unpolluted and unadulterated spring of orthodoxy from the beginning, you the calm harbor of the whole church, removed from every heretical storm, you the God-chosen city of refuge for salvation.”
Also, speaking of the acceptance of the papal primacy in the east before the schism
Francis Dvornik, Byzantium and the Roman Primacy, pages 95 and 96 https://macedonia.kroraina.com/en/fdbrp/dvornik_byzantium_and_the_roman_primacy_1979.pdf :“Another courageous defender of the cult of images, Stephen the Younger, in 760 rejected the Iconoclast Council of 754. Naturally, he mentioned the patriarchs who had likewise rejected it. Speaking of the Pope, he says “according to the prescriptions of the canons, religious matters cannot be defined without the participation of the Pope of Rome.” The most eloquent and the most telling testimony on the Primacy of the Pope is given to us by the intrepid defender of the cult of images, the Patriarch Nicephorus. In his work Byzantium and the Roman Primacy in defense of the cult of images he exalts the importance of the decisions of the seventh ecumenical council when he says:“This Synod possesses the highest authority. … In fact it was held in the most legitimate and regular fashion conceivable, because according to the divine rules established from the beginning it was directed and presided over by that glorious portion of the Western Church, I mean by the Church of Ancient Rome. Without them [the Romans], no dogma discussed in the Church, even sanctioned in a preliminary fashion by the canons and ecclesiastical usages, can be considered to be approved, or abrogated; for they are the ones, in fact, who possess the principate of the priesthood and who owe this distinction to the leader of the Apostles.”