What is the name of the irish archbishop from the 17th century who calculated that the world is now approximately 6,000 years old?

The Usher chronology is a chronology of the history of the world. It was formulated from the Old Testament by James Usher. James Usher was the Archbishop of Armough ( Irish church ) from the 17th century. He calculated that the first day of creation was October 23, 4004 BC. Archbishop James Usher.