Editing Casimir IV Jagiellon (section)

==Youth==
Casimir Jagiellon was the third and youngest son of King [[Władysław II Jagiełło]] (known as Jogaila) and his fourth wife, [[Sophia of Halshany]].<ref>Marian Biskup, Karol Górski: Kazimierz Jagiellończyk: Zbiór studiów o Polsce drugiej połowy XV wieku. Warszawa: 1987. {{ISBN|978-83-01-07291-9}}.</ref> Casimir's mother was 40 to 50 years younger than his father, which caused widespread speculations that the children were the product of [[adultery]].{{sfn|Bogucka|1978}} A scandal erupted when Sophia was accused of marital infidelity and two of her [[ladies-in-waiting]] were subsequently arrested and tortured for disseminating the rumours. To eliminate hearsay, Władysław placed Sophia before a court. It is likely that the [[Teutonic Order]] and [[Grand Master of the Teutonic Knights|Grand Master]] [[Paul von Rusdorf]] were implicated. Following Casimir's birth, Sophia pledged an oath of innocence (''iuramentum purgatorium'') and the charges were dismissed. The question of paternity did not persist as many of the children, including Casimir, closely resembled their elderly father.{{sfn|Bogucka|1978}} 

He was baptised on 21 December 1427 and was named after his deceased brother.{{sfn|Biskup|Górski|1987|p=9}} [[Stanisław Ciołek]], [[Bishop of Poznań]], or [[Mikołaj z Radomia|Nicholas of Radom]] composed a [[panegyric]] [[contrafactum]] titled ''Hystorigraphi aciem'' in honour of his birth which was sung at the christening ceremony.{{sfn|Kowalska|1993|p=140}} In his early years, Casimir was nursed by his mother and supervised by vice-chancellor [[Wincenty Kot]], the future [[Archbishop of Gniezno]] and [[Primate of Poland]], as well as by a knight named Piotr of [[Rytro]]. Casimir often relied on his instinct and feelings and had little political knowledge, but shared a great interest in the diplomacy and economic affairs of the country. After the accession of his brother, Władysław, to the throne of Poland, the tutelage was assigned to Cardinal [[Zbigniew Oleśnicki (cardinal)|Zbigniew Oleśnicki]], however, the cleric neglected his duties as he felt a strong reluctance towards Casimir, believing that he would be an unsuccessful monarch following Władysław's death.{{sfn|Biskup|Górski|1987|pp=9–10}}