1581 – 1656
James Ussher (1581–1656) was Archbishop of Armagh and Primate of All Ireland, a prolific Anglican scholar whose meticulous biblical and patristic scholarship made him one of the most erudite churchmen of his age. He is best known for his comprehensive biblical chronology, which dated the creation of the world to 4004 BC through exhaustive cross-referencing of scriptural genealogies and ancient calendars. Beyond chronology, he produced significant works on church history, the early Irish church, and the relationship between Scripture and natural history.
Calculated the date of creation as October 23, 4004 BC in Annales veteris testamenti (1650), a landmark of early modern biblical scholarship
Served as Archbishop of Armagh and Primate of All Ireland, the highest office in the Church of Ireland
Produced Britannicarum Ecclesiarum Antiquitates, a foundational work on early British and Irish church history
Assembled one of the largest private manuscript libraries in 17th-century Europe, later bequeathed to Trinity College Dublin
Contributed to early debates on the compatibility of scriptural authority with natural and historical evidence