There is little doubt that Cadmus was originally a Boeotian, that is, a Greek hero.
Very true, said Cebes, laughing gently and speaking in his native Boeotian.
It was Cadmus who slew the Boeotian dragon, and sowed its teeth in the ground, from each of which sprang up an armed man.
This was a certain Apollonides there present, who spoke in the Boeotian dialect.
The only alternative however is to suppose that Boeotian poets borrowed it from Asia.
The Boeotian left, as far as the centre, was worsted by the Athenians.
This was a brigade of their Boeotian allies, which was posted low down the slope of Epipolae, outside the city walls.
The Boeotian potter may have appropriated the scene from an Athenian source.
For he is on that mountain; no doubt of it can exist even in the Boeotian mind of one of his subjects; myself, for example.
This consists of the frontal portion of a Boeotian bridle, over parts of which leather straps had probably been tightly fixed.
1590s, "ignorant, dull," from Boeotia, district around Thebes in ancient Greece (said to have been so called for its cattle pastures; Greek bous = "ox"), whose inhabitants were characterized as proverbially dull and countrified by their neighbors, the Athenians. The Boeotians presumably held reciprocal opinions, but their great writers, Plutarch and Pindar, though patriots, are full of praise for Athenian deeds and institutions.
Though his aim was to vindicate Boeotia, [Pindar] has probably done her a disservice, in that he has helped to immortalise the scurrilous proverb Βοιωτία ύς, which he wished to confute. ... If left to itself, the slander might have passed into oblivion long ago. [W. Rhys Roberts, "The Ancient Boeotians," 1895]