1. The licentious monarch helped bring about his country´s downfall.
    这昏君荒淫无道, 加速了这个国家的灭亡。

2. The visitor was the monarch in person.
    来访者乃君主本人。

3. He was the reigning monarch of France, Louis- Philippe.
    他是当时统治法国的国王路易・菲力普签署。