[1] The election of Ferdinand was a natural one because he was not only the powerful Archduke of Austria, he also ruled the lands of Croatia's Slavic neighbours, the Slovenes, as both Duke of Carinthia and Carniola.
[1][3] The horsemen would be divided between the noblemen, and even among those who didn't participate at the election, but probably supproted the outcome (like Budački, Drašković, Patačić, Ajtić, Tomašić, Farkašić and so on).
[1] The charter confirmed at the same time the ancient rights of Croatian nobility to self-regulate the major issues – among which was the election of a king – freely and independently, regardless of opinion or decision of Hungarian Diet, since the two countries were in the personal union from 1102.
[1] The text of the Charter contains first the listing of names of the present Croatian high nobility members, church dignitaries and low nobility members, as well as names and titles of Ferdinand's plenipotentiaries, then the quotation of arguments for the legally valid election of a Habsburger to be the hereditary ruler of Croatia, further the declaratory statement of recognition and announcement of the Austrian archduke as king and his wife Anna (sister of Louis II) as queen, and finally "the swearing-in of loyalty, obedience and allegiance".
[1] The mentioned Croatian nobles are Andrija the Bishop of Knin and Abbot of Topusko, Ivan Karlović of Krbava, Nikola III Zrinski, brothers Krsto II and Vuk I Frankopan of Tržac, Juraj III Frankopan of Slunj, Stjepan Blagajski, Krsto Peranski, Bernard Tumpić Zečevski (of Zečevo), Ivan Kobasić Brikovički (of Brekovica), Pavao Janković, Gašpar Križanić, Toma Čipčić, Mihajlo Skoblić, Nikola Babonožić, Grgur Otmić, noble judge of the Zagreb County, Antun Otmić, Ivan Novaković, Pavao Izačić, Gašpar Gusić, and Stjepan Zimić, while the Austrian plenipotentiaries present were Paul von Oberstein (Provost of Vienna and Ferdinand's Geheimrat), Nikola Jurišić and Ivan Katzianer (Ferdinand's chief military commanders), and Johann Püchler (Prefect of the town of Mehov).
In return, earlier that day, in a document called Coronation Oath, they confirmed the promises and assurances of Ferdinand (given before upon the previous demands of the Croats), and accepted all the related obligations and responsibilities of the new-elected king.
Before their return to Vienna, the plenipotentiaries wrote a letter to their principal on 3 January 1527 in which they informed him about the sequence of events during the parliament session and explained their delay and longer stay in Croatia than expected before (among other things, some of Croatian magnates did not have their seals with them, but needed to go home and to verify the Charter afterwards).
[1] Roughly months later, as Ferdinand didn't keep election promises well, the Croatian nobility again gathered in Cetin and complained that "let Your Majesty know that no gentleman can be found who would rule Croatia by force.