The Kingdom came through Pentecost through the 120 in the upper room, and came prior to the through the life and ministry of Jesus. This explores the breaking in and setting up of this Kingdom, which had existed since at least the foundation of the Earth.
God has been on the throne since things began, and He has not ceased to rule. Only in its entrance at the time of Christ, did it begin to be accessible, through the atoning work of Christ, so that men could take it.