Or just the breach of a strongly-held taboo.
Which indeed may be understood differently in, say, Dara Happa or Prax. I do wonder if there are customs that actually favour inbreeding among the aristocracy somewhere, as in the real world.
The Glorious ReAscent of Yelm had Molanni posit that Yelm marrying any of the other candidates would be incest, but he did not seem all that concerned about it...
>
> > Yet we've had a scenario where a Sartarite clan suffered because two of the
> > members accidentally committed incest, so that notion is found in at least
> > some cultures. And a great deal of effort has been spent on the marriage
> > customs of various Gloranthan cultures, which are partly to avoid the very
> > problem of inbreeding. It's an established problem in Glorantha.
>
> That Sartarites have a problem with incest only shows that Sartarite culture has not the
> myths to deal with it. It's a big jump to assume that the problem is common among
> Gloranthan cultures in general. It's not even likely that other cultures share the Sartarite
> definition of incest. Bear in mind that much of the RW definitition of incest has nothing to do
> with problems of inbreeding but was introduced by the medieval Christian church for
> financial reasons. Nor can we assume that the problems of inbreeding seen in the RW are
> the same as those in Glorantha. I could even argue that it is not incest that brings chaos to
> Skullpoint but kinstrife.
>
> --
> Donald Oddy
>