"Conrad (25 March 1252 – 29 October 1268), called the Younger or the Boy, but usually known by the diminutive Conradin (German: Konradin, Italian: Corradino), was ...
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the Duke of Swabia (1254–1268, as Conrad IV), King of Jerusalem (1254–1268, as Conrad III), and King of Sicily (1254–1258, de jure until 1268, as Conrad II)." - (en.wikipedia.org 28.09.2019)
