At the end of 1362 or early 1363, Bishop
Michael Szécsényi was transferred from the Diocese of Vác to Eger. During that time, John de Surdis was elected as his successor. His election was confirmed by
Pope Urban V on 23 January 1363. He spent the following years in abroad, representing his sovereign in the Italian Peninsula. After a visit to the Avignon in order to pay tax on appointments in 1364, Pope Urban commissioned him to restore and promote peace between his monarch Louis I and his ally
Rudolf IV, Duke of Austria, and
Charles IV, Holy Roman Emperor and
John Henry, Margrave of Moravia. When John de Surdis again visited Avignon still in that year, he assured the pope that Louis I, as only monarch, will provide Hungarian troops to a military campaign against the
Ottoman Empire, when
Peter I of Cyprus attempted to persuade a dozen European monarchs to join Urban's planned crusade. Later, however, the Hungarian king failed to fulfill his promise. While visiting the papal court at Avignon, de Surdis also submitted the church affairs of the Diocese of Vác; for instance, he wanted to procure the church tax liability of those pagan Cumans, who lived in the territory of his bishopric, but the pope did not support him in this effort because of Louis' opposition for pragmatic and military reasons. De Surdis requested permission to pilgrimage to the
Holy Land, but is presumable, that he never realized his intent. In the following years, he again served as envoy of the Hungarian monarch. Alongside
Judge royal Nicholas Szécsi and Cato, provost of
Dömös; he sought the support of Pope Urban in the question of legitimacy of Louis I to claim the Polish throne in 1369. During that visit, John de Surdis and his companions viewed the
Veil of Veronica. John de Surdis was a strong confidant of Louis I as an influential member of the royal council. When the king's distant cousin
Charles of Durazzo was created
Duke of Slavonia in 1371, de Surdis acted as governor of the province on his behalf. Concurrently, when Charles became
Duke of Croatia too in the next year, de Surdis was styled as governor of Dalmatia. He held both dignities until the end of 1372. He was made
royal treasurer in the next year, first mentioned in this capacity by two contemporary documents on 1 May and 2 August. He functioned in this capacity until 1375, while he was also styled as
comes of
Zara (present-day Zadar in Croatia). He was the first office-holder, whose position was included in the dignity lists of the royal charters. For his loyal service, John and his family (his surviving brothers, Raphael and Michael, and a nephew John) were granted the fort of Lipovec by Louis I in 1373. Thereafter they were referred with the surname of Lipoveci (lit. "of Lipovec"). Following the death of
Coloman (otherwise the late King Charles' illegitimate son), John de Surdis was elected Bishop of Győr sometime around May 1375. However, soon, he was translated to the Archdiocese of Esztergom by
Pope Gregory XI on 23 January 1376, following the death of
Thomas Telegdi. During that time, he resided in the papal court, initially in order to confirm his election of Bishop of Győr. the contemporary royal documents considered the bishopric of Győr as vacant. John de Surdis died around May or June 1378. == References ==