Of or relating to guastallo or guastalla, historical Italian territories or possessions.
From the Italian place name Guastalla, a small duchy in northern Italy, with -ine suffix forming an adjective. Used in historical and heraldic contexts.
Guastalla was one of Italy's tiniest states—so small that most people have never heard of it, yet it appears in Renaissance maps and treaties because of its political marriages and alliances!
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