scholar and historian who brought the treasures of Icelandic literature to the attention of Danish and Swedish scholars.

Jónsson studied at the University of Copenhagen and returned to Iceland to head the Latin school at Hólar, which had been established to educate the new Reformed clergy and had become a general centre of learning. There, Jónsson collected Icelandic manuscripts on which he based his studies of Icelandic and Scandinavian history.

In 1597 Jónsson produced for the Danish government a digest of his studies, which presented virtually a new history of Norway and Denmark and threw light on the early history of Sweden. Though never published in full, it was probably his most influential work. Crymogaea (1609) and Specimen Islandiae Historicum et Magna ex Parte Chorographicum (1643), which described Iceland and its history, were his most widely read publications. Jónsson's scholarship was not fully accepted until the end of the 17th century. From then on, it became the foundation on which his successors built for 200 years.