[1] Family members of the Omiš branch were known for piracy in the Adriatic Sea, clashes with Venice, and were even accused of Patarene heresy.

[3] The clearest established connection is the noble Hodimir, mentioned in 1207 in a charter of St. Peter's Church in Bubnjani near Tinj,[3][16] whose son Nikola was an Omiš knez.

[3] In the 12th and 13th centuries Kačićs possessed lands in the Zadar hinterland, in the wider area of Tinj, Nadin, Kačina Gorica, Kokićani and Kamenjani.

[3] From the mid-14th to 15th century, their holdings expanded to include Podnadin, Bistrovina, Butina, Kačina Gorica, Suhovaram, Grguricavas and Krneza, and the wider area around those villages.

[3] According to M. Marković, in the early 11th century, the lands West of Nadin were ruled by the tribe Lapčan, while in the East by family Kašić.

[3][18][19] In the 15th to 17th centuries a branch settled in the wider area of Cazin and Bosanska Krupa, where in 1487 there was a dispute between them and the Babonić noble family.

Family political influence at that time included Brač and Hvar, Breueco (Brenti, Brevko, Brečko)—also of genus Kačić—as well as the previous Šibenik iupanus (župan).

[21] Archbishop Rogerije, who also served Byzantine Emperor Manuel I Komnenos as representative governor of Croatia, had become involved in a dispute about an estate around Mosor.

[3] In the 13th century the terms Kačićs (Kačići) and residents of Omiš (Omišani) are both mentioned, making it sometimes more difficult to reliably identify members of the genus.

[3] They achieved a large degree of independence from the central government and imposed the name of Omiš and Kačić family over the entire region.

[3][4] Kačićs and Omiš citizens made a peace treaty with Venice in 1208, and the brothers Desislav, Radoš, Dragan, Bogdan and Sinko were mentioned by knez Sebena in the document.

[3] In 1220, the Hungarian-Croatian king Andrew II threatened retaliation with the royal army against knez Malduč and his relatives unless the piracy and heresy ended.

[3] Nikola of Hodimir and Pribislav of Malduč claimed bail in May 1239 for the Omišani who murdered Dubrovnik nobleman Grubeša and looted his ship.

[3] In March 1244, the Holy Roman Emperor Frederick II threatened conflict with the Omišani over damage incurred along the Apulian coast.

[3] In 1256, a dispute between knez Osor and the city Trogir about property in the village of Bijaći was resolved by king Béla IV and ban Stjepan.

[3] The citizens of Omiš responded by an alliance with Venice in August, in accordance with a 20-year peace treaty signed by knezes Radoš, Bogdan, Juraj and Semen.

[3] The war with Venice at the end of the 1270s and the beginning of the 1280s led to their loss of Omiš in favor of princes from the Šubić noble family.

[3] They returned to Dalmatia, one brother to Zadar, another to Šibenik, and the last two to the Makarska Riviera, where they started building castles in Gradac and Trpanj, as well as practicing piracy up to Apulia.

[3] Venice accepted the request, confirmed their old customs, allowed the foundation of fort and port in Makar, and forgave older violence.

[3][38] Simon took part in the murder of Queen Gertrude of Merania (24 September 1213); therefore, King Andrew II of Hungary confiscated his possessions.

[38][39] Supporters of Andrew II in his rebellion against the elder brother and then king Emeric may have included the noble family Kačić.

[37] Michael's son Falkos (1255) held properties at Szécsény and Nógrád, and was the founder of genus Libercsei, from which emerged powerful Szécsényi, Geréb of Vingárta, and Farkas of Szeszárme.