Given the infamy, at least as promoted by their enemies, of the Borgias not quite a century later, not to mention how often this Officially happened in recorded

Given the infamy, at least as promoted by their enemies, of the Borgias not quite a century later, not to mention how often this Officially happened in recorded history, I'm surprised the researchers were surprised. Then again, they might well know that plenty of rumored or official poisonings were just the normal day in, day out deaths in pre-modern public health and then medicine days. About the first thing my professor in Renaissance history did was to try to get across the omnipresence of death in pre-modern times, something that's the antithesis of today's 1st World Zeitgeist.