Since the transfer of the patriarchal residence to Udine, the Venetians had never lived in peace with Aquileian patriarchs, of whose Imperial favour and tendencies they were jealous. From about 1400, Venice under the doge
Michele Steno and his successor
Tommaso Mocenigo began to enlarge its
dogado by gradually occupying the Aquileian hinterlands. At the same time, the Patriarchal State suffered internal conflicts between the citizens of Cividale and Udine. In 1411, those conflicts turned into a war which was to mark the end of the Patriarchal State. Cividale received support from most of the Friulian communes, the
Carraresi of Padua, king
Sigismund of Germany, while Udine was backed by the Venetians. In the December of that year an Imperial army captured Udine, and in January 1412
Louis of Teck was enthroned as patriarch in the city's cathedral. On 23 July 1419 the Venetians conquered Cividale, and then continued to advance further. Udine fell to Venetians on 7 June 1420 after a long siege. Soon afterwards
Gemona,
San Daniele,
Venzone and
Tolmezzo followed. In the same time, Aquileian possessions in Istria, including Muggia, Labin and Plomin, surrendered to Venice in 1420. Thus, the core territories of the Patriarchal State were captured by the Venetians, and the temporal authority of the patriarch was lost on 7 July 1420 when its territories were secularised by Venice. The former Patriarchal State was thus incorporated into the Venetian Republic with the name of
Patria del Friuli, and ruled by a General Proveditor or a
Luogotenente residing in Udine. Unwilling to accept such outcome, patriarch Louis of Teck retreated to
Cilli, refusing to recognize Venetian annexation of his lands. In April 1422, he attempted to invade Friuli, but was pushed back by the Venetians. Another attempt was repeated in September of the same year, but also failed. Louis' final attempt was repelled in 1431 by the Venetians. In 1433, Venetian doge
Francesco Foscari signed an agreement with emperor Sigismund, whereby the Empire ceded the
Domini di Terraferma, stretching from the Adriatic Sea to the Alps, to the Republic, then officially as an Imperial fief. The territory around Gorizia and Aquileia proper was retained by the Counts of Görz; the last Count
Leonhard in 1500 bequeathed his lands to Archduke
Maximilian I of Austria, who also annexed the city of
Gradisca in 1511. The former Görz territories were incorporated into the
Inner Austrian possessions of the Habsburgs. In 1445, after new patriarch
Ludovico Trevisan at the
Council of Florence had acquiesced in the loss of his ancient temporal estate in return for an annual salary of 5,000 ducats allowed him from the Venetian treasury, the conflict could be considered as finally over. Henceforth only Venetians were allowed to hold the office of the Patriarch of Aquileia. In 1469, the Emperor
Frederick III confirmed Venetian possessions in Friuli, and in 1523 emperor
Charles V ultimately renounced any Imperial feudal rights to the territories of the former Patriarchal State of Aquileia. ==Parliament==