Since the announcement of his birth, the Only-begotten Son of the Father, born of the Virgin Mary, was described as "king" in the Messianic sense, that is, heir to the throne of David in accordance with the Prophets' promise, for a Kingdom that would have no end (cf. Lk 1: 32-33). The kingship of Christ remained completely hidden until he was 30 years old, years spent in an ordinary life in Nazareth. Then, during his public life, Jesus inaugurated the new Kingdom which "does not belong to this world" (Jn 18: 36), and finally, with his death and Resurrection, he fully established it.
Pope Benedict XVI, ANGELUS, November 20, 2005