Church history refers to the development and evolution of the Christian church from its beginnings in the first century to the present day. It includes the life and teachings of Jesus Christ, the spread of Christianity through the Roman Empire, and the establishment of various denominations. Key events include the Council of Nicaea in 325 AD, which addressed theological disputes, and the Reformation in the 16th century, which led to the formation of Protestant churches. Throughout its history, the church has played a significant role in shaping culture, politics, and society. It has faced challenges such as persecution, schisms, and controversies over doctrine. Important figures like Martin Luther and John Calvin contributed to theological debates, while movements like the Great Awakening emphasized personal faith. Today, church history continues to influence modern Christianity and its practices.