Arms of Sigismund of Luxembourg

 

King of Hungary and Croatia, 1387-1487, King of Bohemia, 1419-1487, Holy Roman Emperor, 1433-1437 (1368-1437)

Blazon: Per pale barry of eight gules and argent (Hungary ancien) and gules a lion double-queued rampant argent, armed, langued, and crowned or (Bohemia moderne)

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No one was admitted to the lists, who could not prove himself, at least maternally, to be one of four descents and display a legitimate coat armour.

-From Inquiries into the Origin and Process of the Science of Heraldry in England by James Dalloway, p90

Essentially, in order to compete in a tournament, you had to have at least one great-great-grandfather, if not more, who was noble and bore arms.