The senior Augustus in particular was made a separate and unique being, accessible only through those closest to him. Diocletian's own court was based at Nicomedia. She was the daughter of William V, Duke of Aquitaine and Agnes of Burgundy. While a coronation by the Pope was seen as a requirement for hundreds of years in order to be seen as legitimate, the practice fell into decline during the religious strife that was the Reformation. From 1728 until 1737 he was Duke of Lorraine. " Meanwhile, Charlemagne's power steadily increased: he subdued Istria and several Dalmatian cities during the reign of Irene, and his son Pepin brought Venice under Western hegemony, despite a successful counter-attack by the Byzantine fleet. In 1355 he was crowned King of Italy on 6 January and Holy Roman Emperor on 5 April. Modern historians conventionally regard Augustus as the first Emperor whereas Julius Caesar is considered the last dictator of the Roman Republic, a view having its origins in the Roman writers Plutarch, Tacitus and Cassius Dio.  Among their permanent privileges were the traditional Republican title of princeps senatus (leader of the Senate) and the religious office of pontifex maximus (chief priest of the College of Pontiffs). Frederick I (German: Friedrich; 1122 – 10 June 1190), known as Frederick Barbarossa, was the Holy Roman Emperor from 1155 until his death. During the Late Republic, the most powerful had this right extended. Otto II spent his reign continuing his father's policy of strengthening Imperial rule in Germany and extending the borders of the Empire deeper into southern Italy. Called the "Father of Europe" (pater Europae), Charlemagne united most of Western Europe for the first time since the Roman Empire. When Augustus established the Princeps, he turned down supreme authority in exchange for a collection of various powers and offices, which in itself was a demonstration of his auctoritas ("authority"). Rudolf's legacy has traditionally been viewed in three ways: an ineffectual ruler whose mistakes led directly to the Thirty Years' War; a great and influential patron of Northern Mannerist art; and a devotee of occult arts and learning which helped seed the scientific revolution. While he was preparing to counterattack Muslim forces, a major uprising by the Slavs broke out in 983, forcing the Empire to abandon its major territorial holdings east of the Elbe river. He was a member of the House of Habsburg. It seems that from then on Octavian (later the first emperor Augustus) used imperator as a first name (praenomen): Imperator Caesar not Caesar imperator. Granted lordship over Alamannia in 876 following the division of East Francia, he succeeded to the Italian throne upon the abdication of his older brother Carloman of Bavaria who had been incapacitated by a stroke. He was the heir of three of Europe's leading dynasties, the House of Habsburg of the Habsburg Monarchy, the House of Valois-Burgundy of the Burgundian Netherlands, and the House of Trastámara of the Crowns of Castile and Aragon. Louis the Pious (778 – 20 June 840), also called the Fair, and the Debonaire, was the King of Aquitaine from 781. Her maternal grandparents were Otto-William, Duke of Burgundy and Ermentrude of Rheims. At some points in the Empire's history, the emperor's power was nominal; powerful praetorian prefects, masters of the soldiers and on a few occasions, other members of the Imperial household including Imperial mothers and grandmothers were the true source of power. The word princeps (plural principes), meaning "first", was a republican term used to denote the leading citizen(s) of the state. Starting with Emperor Heraclius, Roman emperors styled themselves "King of Kings" (from the imperial Persian Shahanshah) from 627 and "Basileus" (from the title used by Alexander the Great) from 629. The territory of Lorraine (Lothringen in German) is named after him. With his coronation as King of Burgundy, delayed until 4 June 1365, he became the personal ruler of all the kingdoms of the Holy Roman Empire. Charles was only 54 when he abdicated, but after 34 years of energetic rule he was physically exhausted and sought the peace of a monastery where he died aged 58. Usually considered lethargic and inept – he is known to have had repeated illnesses and is believed to have suffered from epilepsy – he twice purchased peace with Viking raiders, including at the famous siege of Paris in 886. Joseph continued the War of the Spanish Succession, begun by his father, against Louis XIV of France, in a fruitless attempt to make his younger brother Charles (later Charles VI, Holy Roman Emperor) King of Spain; in the process, however, owing to the victories won by his military commander, Prince Eugene of Savoy, he did succeed in establishing Austrian hegemony over Italy.