27. a man of Ethiopia—Upper Egypt, Meroe.
an eunuch of great authority—Eunuchs were generally employed for confidential offices in the East, and to some extent are still.
Candace—the family name of the queens of Upper Egypt, like Pharaoh, Cæsar, &c. (as appears from classic authors).
had come to Jerusalem to worship—that is, to keep the recent feast of Pentecost, as a Gentile proselyte to the Jewish faith. (See Isa 56:3-8, and Joh 12:20).