Background
He was born at Itzehoe, Holstein, the son of a tradesman, and educated at the Gelehrtenschule des Johanneums.
He was born at Itzehoe, Holstein, the son of a tradesman, and educated at the Gelehrtenschule des Johanneums.
He went to study at Rostock and Helmstedt in 1616, and in 1617 was in Leiden. After a period at Hamburg, where he encountered in particular Holstenius, he returned to Leiden in 1624, where he received a doctorate in law. Loccenius was recruited by Johan Skytte for Gustavus Adolphus, and went to Sweden.
From 1628 to 1642 he taught a humanist and political syllabus as professor skytteanus.
From 1634 he also taught Roman law. As librarian also at the University of Uppsala, he received the embassy of Bulstrode Whitelocke, and they discussed English jurists including Francis Bacon and John Selden.