Early Christian sects emerged in the first few centuries after the death of Jesus Christ. These groups often had differing beliefs and practices, leading to a variety of interpretations of Christian teachings. Some notable sects included the Gnostics, who emphasized secret knowledge for salvation, and the Montanists, who believed in new revelations from the Holy Spirit. As Christianity spread, these sects sometimes clashed with each other and with the emerging orthodox beliefs. The Council of Nicaea in 325 AD aimed to unify Christian doctrine, but many sects continued to exist, contributing to the rich diversity of early Christian thought and practice.