a. Until the 12th century or so, dates of birth even for kings are somewhat fuzzy, sometimes not even the year is certain. Deaths are usually better recorded, but anyway, there will be some systemic uncertainty there.
b. When evaluating whether a particular king's death was natural or not (the GP wanted to exclude non-natural deaths), we must take into account that a successful poisoning might look like sudden-onset gastritis or so, and that kings were absolutely a plausible target for such attacks. It works both ways; Ladislaus the Posthumous (died 1457) was widely suspected to have been poisoned, only a detailed scientific examination of his skeleton in the 1980s proved that cause of his death was a non-Hodgkin lymphoma.
a. Until the 12th century or so, dates of birth even for kings are somewhat fuzzy, sometimes not even the year is certain. Deaths are usually better recorded, but anyway, there will be some systemic uncertainty there.
b. When evaluating whether a particular king's death was natural or not (the GP wanted to exclude non-natural deaths), we must take into account that a successful poisoning might look like sudden-onset gastritis or so, and that kings were absolutely a plausible target for such attacks. It works both ways; Ladislaus the Posthumous (died 1457) was widely suspected to have been poisoned, only a detailed scientific examination of his skeleton in the 1980s proved that cause of his death was a non-Hodgkin lymphoma.