Research into the public life of Kazimierz (Casimir) (1458-1484), the second son of King Kazimierz IV Jagiellonczyk and Elizabeth of Austria, has always been hampered by the paucity of source material. Although the last decades of the 15th century are by no means under-represented in the sources, the coverage of Poland's political history no longer received the privileged coverage that it had got in Dlugosz's Annales (until 1480). This is especially true of the regency of Prince Kazimierz. In spite of the fragmentary nature of the collected data, the author attempts to chart the political career and present the dynastic (marital) plans of Kazimierz, Prince Royal from the time of his childhood and youth, when he was trained in the arts of diplomacy, royal administration, and oratory. Like his brothers, the boy was brought up to become ruler of one of the Central European countries and at one point nearly became king of Hungary. Indeed, until the last year of his life Kazimierz looked forward to a royal future for himself. Although he always had a reputation for piety, it was not until late 1483 that his religious life acquired an ascetic stringency. By then he had become keenly aware that his life, wasted by an incurable illness (tuberculosis), would not last much longer. Following his father's wish, Kazimierz acted as regent in 1482-1483. Having set up his headquarters in Radom, he toured the country performing the royal duties. He had his own chancellor's office, put his signature to official letters, issued documents, and kept his own court, which consisted of Polish and Hungarian knights. Contemporary opinion was unanimous in praising his short term of regency. It was expected that Kazimierz would be a worthy successor of his father on the Polish trone (his elder brother Wladyslaw had been elected King of Bohemia in 1471); those hopes were, however, dashed by the death of the young prince.
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