Berthold IV (c. 1159 – 12 August 1204), a member of the House of Andechs, was Margrave of Istria and Carniola (as Berthold II). By about 1180/82 he assumed the title of Duke of Merania, referring to the Adriatic seacoast of Kvarner which his ancestors had conquered in the 1060s and annexed to Istria and Carniola.
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Life
Berthold was the son of Count Berthold III of Andechs and his wife Hedwig of Wittelsbach. His father had been a loyal vassal of Emperor Frederick Barbarossa and in turn was enfeoffed with the Istrian march upon the death of the Sponheim margrave Engelbert III.
Young Berthold IV first appeared in 1170 and was mentioned as Count of Andechs in an 1172 deed. In 1175 he served as co-ruler in the March of Istria. After Emperor Frederick deposed Duke Henry the Lion in 1180, his maternal uncle Otto of Wittelsbach received the Duchy of Bavaria, while Berthold received the Duchy of Merania. The rule over the self-styled "Merania" actually encompassed the same area as the old Istrian margraviate, and did not constitute a separate administrative or political entity; however, its ruler gained prestige from his new ducal title, and the comital House of Andechs was elevated to Princes of the Holy Roman Empire.
In 1186, he accompanied Emperor Frederick's son Henry VI to Italy and his marriage with Constance of Sicily. In 1189, he led the third division of the imperial army and was its standard-bearer on the Third Crusade, in which he led the Crusaders with Frederick VI, Duke of Swabia in the Battle of Philomelion in 1190. In 1195, he appeared as Vogt (reeve) of Tegernsee Abbey in Bavaria. Berthold committed himself to join the Crusade of 1197, however, he did not participate until Henry's death in the same year. Though he had opposed the emperor's Erbreichsplan, he backed the claims of Henry's younger brother Philip of Swabia against the politics of Pope Innocent III who supported Philip's Welf rival Otto IV. At this juncture, the House of Andechs was at the height of its power and influence, with extended possessions stretching from Franconia down to the Adriatic.