Midrasch zu Tehillim 37:37

“And Mordekhai went out from before the king in royal dress of blue and white wool, and a great gold crown, and a robe of fine linen and purple. The city of Shushan reveled and rejoiced” (Esther 8:15).
“And Mordekhai went out from before the king in royal dress…” Rabbi Pinḥas says: Mordekhai reigned over the Jews. Just as the king wears purple, so did Mordekhai wear purple. Just as the king sets a great crown on his head, so did Mordekhai wear “a great gold crown” (Esther 8:15). Just as fear of the king is over the whole land, so was fear of Mordekhai over all of them, as it says: “For fear of Mordekhai had fallen upon them” (Esther 9:3). Just as the king’s coin is accepted in the entire land, so was Mordekhai’s coin accepted. And what was his coin? Mordekhai on one side and Esther on the other. Why? Because he was a good man and a peaceful man and sought peace, as it says: “For Mordekhai the Jew…[a seeker of good for his people and a spokesman of peace for all his descendants] (Esther 10:3). About him scripture says: “Mark the man of integrity and behold the upright one, for there is a future for the man of peace” (Psalms 37:37).

Rabbi Phineas said: Mordecai ruled over the Jews. Just as the king is dressed in purple, so was Mordecai dressed in purple, as it is said, "And Mordecai went forth from the presence of the king in royal apparel" (Esth. 8:15). Just as the king has a crown upon his head, so Mordecai had a crown upon his head, as it is said, "And Mordecai went forth… with a great crown of gold" (ibid.). Just as the king's fear obtains in all the land, so was the fear of Mordecai upon them, as it is said, "Because the fear of Mordecai was fallen upon them…" (Esth. 9:3). Just as the king's money is current throughout the land, || so was Mordecai's money current in all the land, as it is said, "For Mordecai was great" (Esth. 9:4). What was the money of Mordecai? On the one side was (the face of) Mordecai and on the other (the face of) Esther. Wherefore? Because he was a good man, and a man of peace and seeking the peace of his people, as it is said, "For Mordecai the Jew was next unto king Ahasuerus, and great among the Jews" (Esth. 10:3); concerning him the Scripture saith, "Mark the perfect man, and behold the upright: for the latter end of (that) man is peace" (Ps. 37:37).