There was a kingdom that was offered to the Jews in the time of Christ, and they rejected it:
John 1:11 He came unto his own, and his own received him not.
There is a spiritual kingdom which every believer becomes a part of when he is born again.
Colossians 1:13 Who hath delivered us from the power of darkness, and hath translated us into the kingdom of his dear Son:
There is a coming kingdom, a millennial kingdom, a kingdom on this earth, a kingdom which the disciples of Jesus knew about and Jesus taught them about it:
Act 1:6 When they therefore were come together, they asked of him, saying, Lord, wilt thou at this time restore again the kingdom to Israel?
Act 1:7 And he said unto them, It is not for you to know the times or the seasons, which the Father hath put in his own power.
Christ taught the coming of an earthly, literal kingdom (cf. Mat_19:28; Luk_19:11-27; Luk_22:28-30).
What Kingdom are you speaking about?