In preparation of a new Saga, I am seriously looking hard at playing a Gifted Mercere, that rarest of lines.
So, naturally I read the House Mercere chapter in True Lineages and discover that the House has only a dozen-odd Gifted Mercere, because they only train their own. Each magus Mercere is expected to start producing offspring as early as possible. This strikes me as a mixed r/K strategy; not only many offspring, but well cared for. I further discover that there's a case example; Mutantes had three unGifted sons, each of whom had 'several' unGifted children, and finally in the fourth generation a Gifted great-grandchild was born. Assuming three children in each iteration, that's 39 descendants for the Gift to show. (3 sons, 3 each grand children is 9, 3 each again grandchildren is 27: 27+9+3=39). One case does not make a pattern, but it's all I've got.
There are a dozen, let's say exactly 12, Magi Mercere of the bloodline, all descendants of the Founder, meaning that to produce those 12 took about 468 births to produce that dozen, assuming the above is typical for this bloodline. I wonder where the other cousins are? I doubt they are all Redcaps, or even all the various other administrators, merchants, and other necessary functionaries of House Mercere (that would be 36 per Tribunal, by the way). I seem to understand House Mercere recruits inclined mundanes.
It follows that the House tracks as many of the descendants of Mercere as they can in the interest of breeding back distant cousins, and to watch for the rare birth of a Gifted child.
Back to my proposed character,though. If a male magus, it seems that he would have relatively little difficulty finding women willing to bear a child or two for the relative luxury a mage can offer, even considering the off-putting Gift. It's mercenary and calculating, but also quite medieval. I wonder how many "wives" could be reasonably supported. The strategy is straightforward: have a many children as can be supported, and make sure they are well cared for. If he takes a dozen wives (which seems quite a lot) and they all produce two children, that's 24 children before it's time for the Longevity Ritual. If they all have 2 children, that's 48 grandchildren, and 72 descendants in two generations; the odds of a Gifted child being born, and possibly 2. Many children would have more, but some would have fewer, or none. There are, of course, many social consequences to this sort of thing.
If a woman magus, there's a mother-months problem. She can usually only have one child at a time. Even if she is absolutely dedicated to being as pregnant as possible, she can "only" have about 16 children, and that's unlikely. Less than twelve seems more likely - although my great-aunt Ruth did have a dozen children, and she is not the only woman of her generation I've met with similar accomplishments. If a Maga Mercere were to produce 12 children in her reproductive lifetime, and they had a more reasonable number, say 6 (again, medieval), that's 72 children in two generations, as above.
All of this ignores the various problems of surviving childhood, although a covenant should make an excellent place for child survival, especially the child of a mage.
It occurs to me the thing to do for maximum likelihood of producing a Gifted child would be for a Magus/Maga Mercere to find an equally interested Gifted person of the opposite sex; this might be expected to double the odds, although this may not be the case. The story hooks are plentiful: other mage might have entirely other plans for the child. M on M breeding may be better for the Maga Mercere, as she might be reasonably thought to be able to retain control of the child.
Yes, this is all very calculated, but that's medieval inheritance for you.
Thoughts?
Naturally, I am scouring the ArM books for useful spells and effects. So far, the most useful bit is the rules on childbirth in Art & Academe.