John II of Luxembourg (The Kalmar Union)

John II was King of Bohemia, King of Hungary, Margrave of Brandenburg, Duke of Luxembourg for thirty years in the 15th century, however unlike his father and grandfather failed to keep the Imperial throne in Luxembourg hands.

The eldest son of Emperor Matthew and Katherine of Brussels (herself the eldest daughter of Charles IV of Anglia).

However John failed in his bid to secure the Imperial throne. Originally this perhaps was a result of his father's failings rather than his own; Matthew had spent most of his reign deeply involved in Hungary and as a result neglected German affairs. John however failed three times, in 1444, 1450 and 1471 to gain the trust of the electors. This broke the run of four emperors which the Luxembourg family had secured