Assertion: national flag's design | /r/CapableOf | become by antonomasia
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Source sentences:
text: The Cross of Burgundy is one of the most important flags in the history of Spain, because after the marriage of Juana I of Castile "the Mad", daughter of the Catholic Monarchs, to Philip the Handsome, Archduke of Austria in 1496, it introduced in to Spanish vexillology a design that, although of foreign origin,[a] would later become the primary Spanish symbol by antonomasia, regardless of the color of the cloth on which it was embroidered (usually white or yellow).