For me, Goiás flag is more beautiful, but I think the Piauí flag is more recognizable, so I'm going to change the Goiás one. My first idea to Goiás flag was using the Anhanguera's fire, but I couldn't give good use to it. My second try was very likeable:
Traditionally, the stars layout is said to symbolize the first colonial names of Brazil, Ilha de Vera Cruz ("True Cross Island", when Brazil was considered a island yet) and Terra de Santa Cruz ("Holy Cross Land"). The state is considered the heart of Brazil, and a flag like this is a good way of symbolize it.
Oh, I must not forget the Piauí! The first Piauí flag had a square canton and no written. This is a date, March 13rd 1823, day of a victory by Independentist Troops in state territory — I should admit that I never knew before about this battle, and it's unimportant, because Brazil made probably the most peaceful independence in Iberic South America, and the Piauí had, at that moment, about 12 years of existence. I'll be original and keep the retangular star, but without the written.
I must thanks Jack Expo, that give me the idea to this post.
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