
Sentence Structure
The evil ruler has been abdicated from the throne,
The evil ruler has been removed from the throne,
The evil ruler has abdicated the throne,
These two lines sound a little off. Feels like a word is missing.
I get the gist of the message you may wish to convey however in a poem, the slightest of changes can affect the overall meaning of the idea.
Perhaps, it may be better to rephrase or recraft the entire sentiment.
Her strength is not by oppression,
Her strength is the love
Her strength is not demonstrated by oppression,
Her strength is demonstrated by love

Overall Impression
The poem provides the name of the legitimate ruler. Also, the theme of the poem is about the Queen from the perspective of her loyal subjects.
By starting the series with a poem, it sets the tone as well as some background information. I have an impression that the throne was previously occupied by a false queen who has been removed. I have the impression that trust and security within the royal kingdom has restored by the presence of the rightful queen.