Returning from Egypt, Joseph feared to go to Judea because who was reigning there?

Answer: Archelaus

Learning that Archelaus reigned in Judea in place of his father Herod, Joseph withdrew to Galilee and lived in Nazareth.

“But when he learned that Archelaus was reigning in Judea in place of his father Herod, he was afraid to go there. And having been warned in a dream, he withdrew to the district of Galilee, and he went and lived in a town called Nazareth. So was fulfilled what was spoken through the prophets: “He will be called a Nazarene.””— Matthew 2:22-23 (BSB)