More to the point in this forum is that Robespierre was not a medieval
figure, but since he was an individual with ancestors and relatives he
is of course a genealogical one.
He satisfies three of the four definitions for genealogy in the OED (of
which the middle two are labelled as obsolete):
" 1. An account of one's descent from an ancestor or ancestors, by
enumeration of the intermediate persons; a pedigree.
†2. Lineage, pedigree, family stock. Obs.
†3. Progeny, offspring. Obs.
4. The investigation of family pedigrees, viewed as a department of
study or knowledge."
You won't get very far in medieval genealogy by ignoring childless
members of a family. Researchers whose interest is confined to their own
biological ancestors are missing most of the picture and much of the fun.
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