3 adjectives to describe foundings

The celebration itself was called the Festival of the Founder, with reference, I suppose, to the alleged founding of the cities of Mayapan and Chichen Itza by this hero-god.

To still another service rendered by Lorenzo to the cause of the Renaissance attention must be calledthe founding of the Florentine Academy for the study of Greek.

It still stands on the Piazza, a masterpiece of scientific bronze-founding, the first great portrait of a general on horseback since the days of Rome.

3 adjectives to describe  foundings