progenitor(n = noun.person) primogenitor - an ancestor in the direct line;
is a kind of ancestor, antecedent, ascendant, ascendent, root
has particulars: genitor

   An ancestor in the direct line; a forefather. [1913 Webster]
"And reverence thee their great progenitor." [1913 Webster]

progenitor, n.
1 the ancestor of a person, animal, or plant.
2 a political or intellectual predecessor.
3 the origin of a copy.

Derivative:
progenitorial adj. progenitorship n.

Etymology:
ME f. OF progeniteur f. L progenitor -oris f. progignere progenit- (as PRO-(1), gignere beget)

N  paternity, parentage, consanguinity, parent, father, sire, dad, papa, paterfamilias, abba, genitor, progenitor, procreator, ancestor, grandsire, grandfather, great- grandfather, fathership, fatherhood, mabap, house, stem, trunk, tree, stock, stirps, pedigree, lineage, line, family, tribe, sept, race, clan, genealogy, descent, extraction, birth, ancestry, forefathers, forbears, patriarchs, motherhood, maternity, mother, dam, mamma, materfamilias, grandmother, paternal, parental, maternal, family, ancestral, linear, patriarchal, avi numerantur avorum, happy he with such a mother, hombre bueno no le busquen abolengo, philosophia stemma non inspicit.