The 520s decade ran from January 1, 520, to December 31, 529.

Significant people Ahkal Mo' Nahb I, Ajaw (Lord) of Palenque (Mayan Empire) Boethius, philosopher Childebert I, Frankish king, 524-558 Clodoald, saint Chlodomer, King of Orleans, 511-524 Chlothar I, Frankish King Dionysius Exiguus, inventor of the Anno Domini Godomar, King of Burgundy Guntheuc, Queen of Orleans Justin I, Eastern Roman Emperor, 518-527 Kaleb of Axum, King of Ethiopia Sigismund of Burgundy, King of the Burgundians, 516-524 Theoderic the Great, King of the Ostrogoths, 475-526

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