'Principal' in the Bible

Howl, ye shepherds, and cry; and wallow yourselves in the ashes, ye principal of the flock: for the days of your slaughter and of your dispersions are accomplished; and ye shall fall like a pleasant vessel.

And the shepherds shall have no way to flee, nor the principal of the flock to escape.

A voice of the cry of the shepherds, and an howling of the principal of the flock, shall be heard: for the LORD hath spoiled their pasture.

He took also out of the city an eunuch, which had the charge of the men of war; and seven men of them that were near the king's person, which were found in the city; and the principal scribe of the host, who mustered the people of the land; and threescore men of the people of the land, that were found in the midst of the city.