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The Castle Of Weshire recently declared war on the Castle of Boston. The two armies soon met, the Boston King and Weshire King giving out orders from behind their lines of soldiers, surround by their spiritual advisors.

However, due to recent political drama, the Boston King suspected that there was a traitor in the midst. He decided to try to catch the traitor in the act. There was no doubt that they would try to do something as Wehsire Army distracted the Boston army.

The first phase of the battle happened as the armies first marched forth towards each other. The Boston King wept in joy as he saw his son survive the charge. It was very bloody and emotional battle. The King thought he should keep his closest friends closer from now on, as to keep them from being killed, so they could properly advise him.

The first phase diagram-https://www.apronus.com/chess/pgnviewer/?p=MR_K____R__bPPPPPp_B_QB__PpN_____PnN__n__________n_pppppprq__kb_r0

During the second major event, the Weshire army hit Boston’s right flank, and raided some horses to strengthen their calvary. However, the Boston soldiers showed great bravery and managed the kill one of the Weshire army’s religious heads. One was promoted for their heroic act. Another, who died, but who was the bishop killer, was honored for his rightful vengeance. A good soldier always looks out for his King, and gives up their life the moment they see danger to them.

The second phase diagram: https://www.apronus.com/chess/pgnviewer/?p=AR____RK___PPPPP__Q___B_P_NN______NN___p__nb____pr_pppp__qr_nkb_q0

In the third and final swing of the battle, the left flank had been locked up, engaging in a ferocious battle. The Boston Army held a major card against Weshire by threatening to kill their king. Unfortunately, however, Weshire has managed trap the King’s wife after she moved to a bad spot while trying to talk to one of the Boston church priests. After some more battling, both sides agreed to a mutual truce and went home.

The third phase diagram: https://www.apronus.com/chess/pgnviewer/?p=Ar___RRK_r__P______PQ_B________P______PpPn___Pp_p_bppp___q__k_b__0

After arriving back at his castle, the Boston King had a chat with his son, who was a knight. He was sure that a traitor had tried to do something during the battle to harm him in some way. His son shelled out some maps, one for each of the three phases of the battle. On these diagrams, the layout of the battle was shown in its entirety. It was always their army’s time to attack in the moments shown on the ink.

Upon seeing the maps, the Boston King immediately knew who the traitor was. He ordered his council, parliament, advisors, priests, and judges to gather. He sent his son, along with two other knights, to go arrest the traitor.

Who was the traitor who attempted to harm the Boston King?

You must say which piece, and, if necessary it’s starting square, along with where it is in each of the three diagrams. You must also state at three reasons why said chosen piece is the traitor, one piece of proof per diagram/story that goes with it.

Note: There is only one traitor-it is the same in all three diagrams.
Note #2: if you could please edit those links into the words beside them, that would be great. Pretty please and thank you in advance!
Note #3: Enjoy!
Note #4: Cheers to this question-"Murder!", said the knight for inspiring me!,