Though we translate it appeared, yet in the Greek it is, there was seen of him. An angel indeed was there; whether the angel Gabriel or not, or in what form he appeared, it is not said. It is by some observed, that until the Urim and Thummim ceased, no angel appeared to any priest executing his office; after this, it is observed by others, that most appearances of angels to the priests were when they were employed in their service in the temple.
Related Commentaries of Luke 1:11
Luke 1:11
11 And there appeared unto him an angel of the Lord standing on the right side of the altar of incense.