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)
Blazon: Per cross quarterly surmounted by an annulet or, gules and azure, three fish in pall argent, heads towards the fess point
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.
Blazon: Gules a lion rampant or, three molets of six points argent between his paws
King of Naples and Jerusalem (as Charles III), 1382-1386 and II of Hungary, 1385-1386 (1345-1386)
Blazon: Tierced per pale, I barry of eight gules and argent (Hungary ancien); II argent a cross pate between four crosses couped or (Jerusalem); III azure seme de lis or, a label of four points gules (Anjou)
From Inquiries into the Origin and Processes of the Science of Heraldry in England by James Dalloway, p30
Two versions of the Great Seal of King Richard I. The one on the left is from 1189, the one on the right from 1195. The three lions of England are just barely visible on the latter.
Blazon: Per fess argent an antler fesswise sable and gules a letter W of the first