Their possessions were located around Szécsény on the Ipoly River (Slovak: Ipeľ). A member of the gens, Simon took part in the murder of Queen Gertrude of Merania (24 September 1213) and therefore King Andrew II of Hungary confiscated his possessions.
The members of the gens accepted the supremacy of Máté Csák III, one of the most powerful oligarchs of the kingdom, around 1300; only one of them, Thomas Szécsényi became the partisan of King Charles I. Consequently, the king granted him his relatives' possessions following his victories over the oligarch.
- Michael (d. after 1228): Voivode of Transylvania (1209–1212), Ban of Slavonia (1212)
- Simon (d. after 1228): Ban of Slavonia (1212)
- Farkas: Master of the cupbearers for the Queen (1298), father of Thomas Szécsényi
- Simon (d. after 1327): Count of the Székelys (1321–1327)
- Kristó, Gyula (editor): Korai Magyar Történeti Lexikon - 9-14. század (Encyclopedia of the Early Hungarian History - 9-14th centuries); Akadémiai Kiadó, 1994, Budapest; ISBN 963-05-6722-9.
- Majnarić, Ivan (2005). "Kačići". Hrvatski biografski leksikon (in Croatian). Miroslav Krleža Lexicographical Institute. Retrieved 2012-09-11.
- Majnarić, Ivan (January 2009). "Prilog diskusiji o genealoškoj svezi omiških i ugarskih Kačića" [A Contribution to the Discussion Regarding Genealogical Connections between the Kačići (Kacsics) of Hungary and the Kačići of Omiš]. Papers and Proceedings of the Department of Historical Research of the Institute of Historical and Social Research of the Croatian Academy of Sciences and Arts (in Croatian) 26. ISSN 1330-7134. Retrieved 2012-09-11.