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In 1519, in electing the Holy Roman Emperor, candidates aside from Charles of Spain included Frederick of Saxony, Francis of France, and even Henry of England as a dark horse; but AFAICT, there was no consideration for the Grand Duke of Lithuania and King of Poland, Sigismund I (aka the Old).
Does anyone know why this is? And what could have been different to allow the eastern monarch to be a candidate for HRE, and possibly even be selected?