This is a list of bishops and patriarchs of Aquileia in northeastern Italy. For the ecclesiastical history of the diocese, see Patriarchate of Aquileia. From 553 until 698 the archbishops renounced Papal authority as part of the Schism of the Three Chapters and when they returned to the Roman fold they maintained the title patriarch which was adopted during this schism. The Patriarchs gained the Countship of Friuli and the March of Carniola in 1077 and the March of Istria in 1209. The temporal authority of the patriarchate was lost on 7 July 1420 when its territories were secularized by Venice. The Patriarchate was dissolved in 1751 and its ecclesiastical authority divided between the Archbishop of Gorizia (Görz) and the Archbishop of Udine. Bishops of Aquileia, c. 50–355 Saint Mark - founder of community Hermagoras (c. 50–70), Protoepiscopus (first bishop) ... Hilarius of Aquileia or of Panonia c. 276–285, beheaded in the persecutions of Numerian Chrysogonus I c. 286–295 Chrysogonus II c. 295–308 Theodore c. 308–319 Agapitus c. 319–332 Benedictus c. 332–? Viator c. 339-340 Fortunatianus c. 343–355 Archbishops of Aquileia, 355–557 Valerianus 369–388 Chromatius 388–407 Augustinus 407–434 Adelphus 434–442 Maximus I 442–444 Januarius 444–447 Secundus 451–452 Nicetas 454–485 Marcellianus 485–500 Marcellinus 500–513/21? Stephen I 515/521?–534 Laurentius, 534-539 Patriarchs of Aquileia, 539–606 Macedonius 539–556 Paulinus I 557–569 Probinus 569–570 Elia 571–586 Severus 586–606 Schism, 607–698 Patriarchs of Old Aquileia John I 606 Marcianus 623–628 Fortunatus 628–663, moved episcopal residence to Cormons Felix 649–? John II 663–? Agathon 679–680 or 679–? John III 680–? Patriarchs of Grado Candidianus 606–612 Epiphanius 612–613 Ciprianus 613–627 Primogenius 630–648 Maximus II 649 Stephen II 670–? Christophoros 685–? Patriarchs of Aquileia Petrus I 698–700, at the Council of Pavia (698) restored Communion with the Pope Serenus 711–723 Calixtus 726–734, moved episcopal residence to Cividale vacant or unknown 734–772 Siguald 772–776 Paulinus II 776–802 Ursus I 802–811 Maxentius 811–833 Andreas 834–844 Venantius 850–? Theutmar 855–? Lupus I 855–? Valpert 875–899 Frederick I 901–922 Leo 922–927 Ursus II 928–931 Lupus II 932–944 Engelfred 944–963 Rodoald 963–984 John IV of Ravenna 984–1017 Poppo 1019–1042, also known as Wolfgang Eberhard 1045–1049 Gotebald 1049–1063 Ravengerius 1063–1068 Sigehard 1068–1077 Henry 1077–1084 Svatobor (Friedrich) of Bohemia 1084–1085 Frederick II of Bohemia 1085–1086 Ulrich I of Eppenstein 1086–1121 Gerard I 1122–1128 Pellegrino I of Ortenbourg 1130–1161 Ulrich II of Treven 1161–1181 Godfrey 1182–1194 Pellegrino II of Ortenburg-Sponheim 1195–1204 Wolfgar of Leibrechtskirchen 1204–1218 Berthold of