Johann of Cilli was born circa 1430 in Celje, Commune of Celje, Slovenia to Friedrich II, Count of Cilli and Ortenburg (1379-1454) and died 1462 Celje, Commune of Celje, Slovenia of unspecified causes.
Johann of Cilli was an illegitimate son of Friedrich II, Count of Cilli and Ortenburg. He was legitimized by the pope on 15 Nov. 1447.
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