John of Viktring (btw. 1270 & 1280 - November 12, 1347) was a late medieval chronicler and political advisor to the rulers of Carinthia. He is also known as Johannes Victorensis, Johannes de Victoria, John of Victring, Johann von Viktring, or Jo(h)annes Victoriensis. In Slovene he is called Janez Vetrinjski.
Nothing is known of John's early life. In 1307 he became abbot of the Cistercian monastery of Viktring, near Klagenfurt in the Duchy of Carinthia. He was later both chaplain and confidential secretary to the Carinthian duke Henry of Gorizia-Tyrol. Upon the duke's death in 1335, John journeyed to the city of Linz at the request of the Henry's daughter, Margarete Maultasch, to defend her claims to her father's estates before the Emperor Louis IV of Wittelsbach. Nevertheless the two Austrian dukes, Albert II of Habsburg and his brother Otto the Merry, took possession of the contested Carinthian lands in her stead, and thereby became the lords of Viktring Abbey. They too learned to value the abbot's abilities and consulted him in all important government matters. He frequently stayed at their residence in Vienna as a confidential secretary until 1341, when he withdrew to the quiet of his monastery to write a history of his own time.
His chronicle, which he titled Liber certarum historiarum ("Book of certain histories"), has come down to us in various forms. In its original form, as preserved in a manuscript at the Bavarian State Library in Munich, it is a history of the Austrian and Carinthian lands from the accession of the last Babenberg duke Frederick II the Warlike in 1230 until 1341, dedicated to the Habsburg duke Albert II. The information on the earlier period was based on the rhyming chronicle of the medieval historian Ottokar from Gaal and the works by Martin of Opava, while the rest was written from data which he himself had collected during his many travels.
In 1342, he enlarged the book into a chronicle of the Holy Roman Empire, which began with the year 1217. He rewrote it again in 1343, this time beginning with the Carolingian period. This revised work has only reached us through a later compilation, the so-called Chronicon Anonymi Leobiensis. John ranks among the most important chroniclers of the late Middle Ages. He was a very learned man and well acquainted with the Latin and Greek poets. His narrative is lucid, and his judgments on the events of his own time show great impartiality. He is influenced by Otto of Freising, and condemns in his chronicle the anti-Roman policy of Emperor Louis.