According to some historical works, they were original settlers of the republic and their family tree can be traced back to the 10th century making them one of Europe's oldest noble families.
In the manual of the aristocracy, encyclopedia, 1978, volume IV, the following entry is found:
Gučetić Kath. - Patricians from Dubrovnik. - and Hungarian ones. Title of Counts with “de Trebinje et Popovo” suffixes Vienna 23.4.1687 ; Austrian Aristocracy confirmation on 10.11.1817 ; Austrian Confirmation as a “Count of Trebinje and Popovo” 31.5.1818 ; Austrian Aristocracy and coat of arms confirmation by A.E of 16.6.1835, diploma… 27.8.1836.
In the book: Condition increases and grace document for the German Reich and Austrian hereditary country until 1806… of Karl the Friedrich v. franc on lock Senftenegg, 1970, the following is noted:
Gučetić, Raphael Johann de, Patrizier of Dubrovnik, AdBest., 10.XI 1817, Gučetić, Paul de, son of the Wladislaus, Lucas, Lucas Maria, Johann, Paul, Söhne of the Nikola Vladislav, count title as a "Count von Trebinje and Popovo", 31.V.1818.
In the manual of the aristocracy, Gräfliche Häuser, volume XI, 1983, the genealogy of the counts Gučetić is published. After this 1983 nearly all family memberslive in Dubrovnik in addition in Erftstadt Gymnich. Some of the last descendants were:
Nikola or Nikša, attorney, married in Dubrovnik on 19 April 1937 to Erna Bayer, they had 4 children:
Count Orsat Gučetić lived in Erftstadt Gymnich in 1983 and Count Marin Gučetić lived 1983 in Zagreb Sopot II. In the entrance text in the manual of the aristocracy is mentioned: They are the last ones of the genealogy : Gotha gfl. Taschb.1872. The family is known for erecting the oldest arboretum in the world, in Trsteno near Dubrovnik. A branch of the family settled in Venice in the 17th century, where they changed their name from Gučetić to "Gozzi". Carlo Gozzi became famous as a writer, as well as his brother Gasparo. The last descendant of this branch is the Marquis Giorgio Gozzi, who in 1981 wrote a book dedicated to his distant roots: The free and sovereign Republic of Ragusa, 634-1814.