The player takes on the role of medieval history lecturer Wil Mason, whose car breaks down while he drives through Snowdonia in a storm.
Libuinus Subdiaconus is the author of a Vita of Pope Leo IX, compiled on the event of the pope's death in 1054, whence it is also known as De Obitus Leonis.
With this work was a life of John Knox, Eximii viri Joannis Knoxii, Scoticanae Ecclesiae Instauratori, vera Extreme Vitae Obitus Historia. Thomas Dempster also attributes to Smeton Epitaphium Metellani.