In 1285 the Waepon roll of Wijnbergen appeared, showing the start of Heraldry. But surprisingly the colors and symbols of the shields follow directly strict rules. Heraldry was mature with its first document to appear, this is of course suspect and hints maybe to an earlier date for the start of heraldry. The following picture shows a page from this waepon roll.
Question marks at the european start of chess and heraldry are seldomly set. , A lot of interesting surprises appear when you really go digging. The waepon of Moravia is already seen on a grave from 1092. Heraldry explains where the eagle comes from (the czech royal house of Premysl), The red and white chessboard pattern is not explained. The waepon appears 150 years before the start of heraldry, and the checkered pattern is also much earlier then the suppopsed rise in popularity of chess after 1250.