Marriage: contrary to the propaganda promulgated by American conservatives, marriage was not originally conceived for the propagation of children. Instead, it was a political contract based on land ownership.
"Still, it is perhaps most useful not to think of medieval philosophy as defined by the chronological boundaries of its adjacent philosophical periods, but as beginning when thinkers first started to measure their philosophical speculations against the requirements of Christian doctrine and as ending when this was no longer the predominant practice. This view allows late ancient and early medieval philosophy to overlap during the Patristic period; thus Proclus (411–85) belongs to the story of ancient philosophy, even though he is later than Saint Augustine (354–430). Again, this view accommodates the fact that late scholasticism survived and flourished even in the Renaissance. Thus Francisco Suárez (1548–1617), who can arguably be regarded as the last chapter in the history of medieval philosophy, was contemporary with Francis Bacon (1561–1626). Nevertheless by c. 1450, at the latest, radically new ways of doing philosophy were clearly emerging."
Spade, Paul Vincent, "Medieval Philosophy", The Stanford Encyclopedia of Philosophy (Summer 2010 Edition), Edward N. Zalta (ed.), URL.