 Junius engaged Jan van Vliet in his study of Gothic.The earliest extant reference to the first foliation of the Nowell Codex (British Library MS Cotton Vitellius A.xv), which contains the poem Beowulf, was made sometime between 1628 and 1650 by Junius.In 1675, Junius returned to Oxford and died in November 1677 at the house of his nephew Isaac Vossius in Windsor, Berkshire; he was buried there at St George's Chapel.