Are there any unitarian denominations that accept the Ecumenical Councils that occurred before the Great Schism?

There are many denominations out there who claim to be unitarian, do any of them accept all or some of the ecumenical councils? If so which councils do they accept and on what basis? If they accept one not on this list feel free to mention it and explain why. 1. First Ecumenical Council (Nicea, 325 A.D.) 2. Second Ecumenical Council (Constantinople, 381 A.D.) 3. Third Ecumenical Council (Ephesus, 431 A.D.) 4. Fourth Ecumenical Council (Chalcedon, 451 A.D.) 5. Fifth Ecumenical Council (Constantinople, 553 A.D.) 6. Sixth Ecumenical Council (Constantinople, 680 A.D.) - The Quinisext Synod (691 A.D.) 7. Seventh Ecumenical Council (Nicea, 787 A.D.)