What were some of the basic controversies in Christian theology from the first century

What were some of the basic controversies in Christian theology from the first century to the fifth century? Be sure to mention some of the church councils which settled major doctrines during this time period.
No more than two pages, double-spaced, 12-point Times New Roman font, one-inch margins. Remember to include a thesis that addresses the main issue of the prompt in your introduction, body paragraphs that support your thesis, and a brief conclusion. Use MLA formatting and citations as needed. Include a cover page and reference page (not included in the two pages). Encyclopedia of Brittanica is not allowed to we used as a source.