On 4 October 1441 he convened an assembly of all estates at Kutná Hora, where the fundamentals of Hussite belief were laid down as the law of the land.
In 1444, the courts found in his favour against the Taborites, who still refused to comply with the unanimous policy and the Tábor doctrine was decried.
From the beginning, Jan endorsed George of Poděbrady's politics and had all churches ring their bells to mark the reconciliation of the Vratislavskys.
In return, George of Poděbrady considered him to represent the church and alternated between attending Jan Rokycana’s masses and those in St. Vitus Cathedral.
In 1461, George of Poděbrady began aspiring to the crown of the Holy Roman Emperor, which would surely have meant renouncing the chalice of Hussitism.