| The complete title to this work is: SACRATISSIMI PRINCIPIS, INSTITUTIONUM Libri Quatuor. Additi sunt tituli Digestor. De Verborum Significatione Et Regulis Juris.
Justinian (Flavius Petrus Sabbatius, 483 to 565 AD) was Emperor of the Byzantine Empire from 527 until his death, and was a prolific writer. His Codes was considered the foremost legal text during the Middle Ages. This volume, Justinian's Institutes was printed by Danielem a Gaesbeece at Leiden (i.e.Lugd[uni]. Batav[orum].). Notice the unique printing in very small type, leaving a large margin on each page, in which the reader could write his own comments or annotations.