Horace Walpole,
Historic Doubts on the Life and Reign of King Richard the Third
“ But what was most remarkable, the queen dowager tampered in this plot. Is it to be believed, that mere turbulence and a restless spirit could in a year's time influence that woman to throw the nation again into a civil war, and attempt to dethrone her own daughter? And in favour of whom? Of the issue of Clarence, whom she had contributed to have put to death, or in favour of an impostor? There is not common sense in the supposition. No; she certainly knew or believed that Richard, her second son, had escaped and was living, and was glad to overturn the usurper without risking her child. ”
