They had a fight over the Holy Ghost: the Western church accepted the Trinity and the Eastern Orthodox accepted Christ as one and indivisible as far as I know. Please do feel free to correct me!

The first, in 325 AD was the first effort to attain consensus in the church through an assembly representing all of Christendom. The second, in 787 AD, was the seventh Ecumenical Council and the last to be accepted by both the Eastern and the Western churches.

politicians agreed on which books to put into the bible.

Well, one thing I would like to say, Jesus was of the Nicean sect, they were very astute mystics and the Dead Sea Scrolls need to be read and taken into account when studying the Bible. They folded up stakes a long time ago.

The agenda of the synod were: 1. The Arian question: was God-the-Son eternal and uncreated, and consequently fully divine in essence, or was He, as Arius had argued, the first being created by the Father, a super-angel, who then went on to create everything else and rule it in the Father's Name. 2. The date of celebration of the Paschal (Easter) observation 3. The Meletian schism: the bishop Meletius - defying his boss the Patriarch of Alexandria - refused to receive back into communion repented apostates (those who had apostatized during the Great Persecution) and separated from the rest of the Church, forming his own sect, because the rest of the Church did receive them back into communion (after a LONG penance); 4. The validity of baptism by heretics: if a man was baptized into a heretical sect by a heretical priest (such as Meletius), did he have to be baptized again if he left his heretical sect and joined the orthodox; 5. The status of the lapsed in the persecution under Licinius: should those who denied and cursed Christ and surrendered holy Scriptures and sacred artifacts during the Great Persecution, who repented (or claimed to) after the end of the Persecution be reinstated and restored to the communion. The results were: 1: Arius' teaching was unanimously condemned. The Council then attempted to revise the Apostle's Creed in such a way as to preclude Arius' heresy. The result was the Nicene Creed. All but 3 bishops voted for it; the dissenting 3 refused to accept it on the grounds that it employed non-Biblical language and that it was consequntly not right to make acession to it a condition of orthodoxy and membership in the communion. They voluntarily went into exile rather than accept the new creed. 2. The calculation of the Date of the Paschal celbration was rendered independent of the date of Passover. Easter would fall on the 1st Sunday after the 1st Full Moon after the Spring Equinox, and so - if the Full Moon happened on Thursday, Friday, or Saturday, Easter would be celibrated the Sunday before Passover, instead of after. 3. Meletius, it was decided, should remain in his own city of Lycopolis in Egypt, but without exercising authority or the power to ordain new clergy; moreover he was forbidden to go into the environs of the town or to enter another diocese for the purpose of ordaining its subjects. Melitius retained his episcopal title, but the ecclesiastics ordained by him were to receive again the imposition of hands, the ordinations performed by Meletius being therefore regarded as invalid. Clergy ordained by Meletius were ordered to yield precedence to those ordained by Alexander, and they were not to do anything without the consent of Bishop Alexander. In the event of the death of a non-Meletian bishop or ecclesiastic, the vacant see might be given to a Meletian, provided he were worthy and the popular election were ratified by Alexander. As to Meletius himself, episcopal rights and prerogatives were taken from him. These mild measures, however, were in vain; the Meletians joined the Arians and caused more dissension than ever, being among the worst enemies of Athanasius. The Meletians ultimately died out around the middle of the fifth century. 4. Baptism was considered valid *if* the profession of faith and baptismal formula were orthodox, regardless of the shismatic, heretical, or moral qualification of the officiating priest. So those first baptized by Meletians had a valid baptism, while a baptism by the Paulians was invalid. 5. The penitant lapsed were to be treated as hearers/catechumens for the duration of their lives, and if they remained faithful, would be granted Last Rights, restoring them to full communion on their deathbed Finally, the council promulgated twenty new church laws, called canons, (though the exact number is subject to debate[33]), that is, unchanging rules of discipline. The twenty as listed in the Nicene and Post-Nicene Fathers are as follows:[34] 1. prohibition of self-castration; 2. establishment of a minimum 2-year term for catechumen; 3. prohibition of the presence in the house of a cleric of a younger woman who might bring him under suspicion; 4. ordination of a bishop in the presence of at least three provincial bishops and confirmation by the metropolitan; 5. provision for two provincial synods to be held annually; 6. exceptional authority acknowledged for the patriarchs of Alexandria and Rome, for their respective regions (Egypt & Cyrenaica, and Italy south of the Po, respectively); 7. recognition of the honorary rights of the see of Jerusalem, confering upon it an honorary status as Patriachate, putting it on the same ceremonial footing as Antioch, Alexandria, Rome, and Constantinople; 8. provision for agreement with the Novatianists; 9–14. provision for mild procedure against the lapsed during the persecution under Licinius; 15–16. prohibition of the removal of priests by the laity/congregation; 17. prohibition of usury by the clergy; 18. precedence of bishops and presbyters before deacons in receiving Holy Communion, the Eucharist; 19. declaration of the invalidity of baptism by Paulian heretics; 20. prohibition of kneeling during the liturgy, on Sundays and in the fifty days of Eastertide ("the pentecost"). Standing was the normative posture for prayer at this time, as it still is among the Eastern Orthodox and Eastern Catholics. (In time, Western Christianity adopted the term Pentecost to refer to the last Sunday of Eastertide, the fiftieth day.)