James Ussher (or Usher; 4 January 1581 – 21 March 1656) was the Church of Ireland Archbishop of Armagh and Primate of All Ireland between 1625 and 1656. He was a prolific scholar and church leader, who today is most famous for his identification of the genuine letters of the church father, Ignatius….and for his Chronology that sought to establish the time and date of the creation as “the entrance of the night preceding the 23rd day of October… the year before Christ 4004” (“In the beginning God created the heaven and the earth.” [Genesis 1:1]…This beginning of time, according to our chronology, happened at the start of the evening preceding the 23rd day of October in the year of the Julian Calendar, 710 …that is, around 6 pm on 22 October 4004 BC, per the proleptic Julian calendar.)
The Great Disappointment in the Millerite movement was the reaction that followed Baptist preacher William Miller‘s proclamations that Jesus Christwould return to the Earth by 1844, what he called the Advent. His study of the Daniel 8 prophecy during the Second Great Awakening led him to the conclusion that Daniel’s “cleansing of the sanctuary” was cleansing of the world from sin when Christ would come, and he and many others prepared, but October 22, 1844 came, and they were disappointed.
These events paved the way for the Adventists who formed the Seventh-day Adventist Church. They contended that what had happened on October 22 was not Jesus’ return, as Miller had thought, but the start of Jesus’ final work of atonement, the cleansing in the heavenly sanctuary, leading up to the Second Coming.