The Question and Answer section for Richard III is a great resource to ask questions, find answers, and discuss the novel.
Is this the text in question?
I did; with his contract with Lady Lucy,
And his contract by deputy in France;
The insatiate greediness of his desires,
And his enforcement of the city wives;
His tyranny for trifles; his own bastardy,
As being got,...
After Richard seizes the throne, Elizabeth has no choice but to assert herself. Her sons are the direct heirs to the throne, and their uncle has seized their birthright. Danger looms.
That would be William Shakespeare.