David Hannay, 1911 Encyclopædia Britannica, Volume 21… (1911)
“ By his wife Margaret Jasper, he was the father of William Penn, the founder of Pennsylvania. Though Sir William Penn was not a high-minded man, he is a figure of considerable importance in British naval history. As admiral and general for the parliament he helped in 1653 to draw up the first code of tactics provided for the navy. ”
