Rev 17:14

14 These will war against the Lamb, and the Lamb will overcome them, for he is Lord of lords, and King of kings. They also will overcome who are with him, called and chosen and faithful.” 

they will wage war against the Lamb – as described in Chapter 11, against the saints.

He is King of Kings, and Lord of Lords – this title was first given to Nebuchadnezzar, the beast in Dan 2:37. Now it is given to Christ. Finally, it will be given to God at Christ’s appearing, as described in 1 Tim 6:14-15; compare to Titus 2:13. The “rule of Christ” has begun, and the 1,000 year rule of the Martyrs with Christ.