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1456 was a year in the 15th century that marked several significant historical events, including the execution of Joan of Arc's conviction being overturned by Pope Callixtus III and the Ottoman siege of Belgrade. It matters because these events reflected important transitions in medieval Europe, including shifts in religious authority and the ongoing struggle between Christian and Ottoman powers in Eastern Europe.
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July 22: Christian soldiers in the Siege of Belgrade rout the Ottoman Muslim army
Year 1456 (MCDLVI) was a leap year starting on Thursday of the Julian calendar.