Philip had been among the first to go to Samaria with the gospel; now he also was called to witness in the outside world, through this influential official of the ancient kingdom of Ethiopia. The latter seems (like Cornelius, as noted in Acts 10) to have been a proselyte of Judaism, but his witness could bring a significant opening for Christianity to enter Africa.

Source:

KJV Defenders Study Bible, by Dr. Henry Morris, Ph.D.
Publisher: Thomas Nelson
Language: English
DEF 10 ISBN 0-529-10444-x
DEF 10-1 ISBN 0-529-10445-8