Sabbatarian Adventism (1844 - 1860) was the period between the Millerite Movement and the Seventh-day Adventist church when, led by pioneers such as James and Ellen White and Joseph Bates, a foundation was established for what would become the Seventh-day Adventist church. “Sabbatarian” refers to the belief in the observance of the seventh-day Sabbath, and “Adventism” is the belief in the second coming of Christ.