from
Easton's 1897 Bible Dictionary
Archelaus
ruler of the people, son of Herod the Great, by Malthace, a
Samaritan woman. He was educated along with his brother Antipas
at Rome. He inherited from his father a third part of his
kingdom viz., Idumea, Judea, and Samaria, and hence is called
"king" (Matt. 2:22). It was for fear of him that Joseph and Mary
turned aside on their way back from Egypt. Till a few days
before his death Herod had named Antipas as his successor, but
in his last moments he named Archelaus.