49
Besides possible wills and deaths, I'm actually curious about a 1st ruler in the 8th in nativity
Lord 1 in 8 or lord 8 in 1 has traditionally been considered a sign of, if not an early death, at least a premature death. JFK had it and so did Jeffery Dahmer. This isn't the only thing necessary any more than having the ruler of the 1st in a house other than the 8th prevents a premature death.

Morin says:

" ... if the ruler of the first is in the eighth, or the ruler of the eighth is in the first, a premature death is shown either way and the native himself is the principal cause, either by deliberately placing himself in danger, or by doig so unwittingly ..." pg 63 Astrologia Gallica Book 21 Baldwin translation
Elsewhere he would indicate that at the very least, having Lord 1 in 8 would indicate a danger to life at some point, particularly if the ruler of the ASC was a malefic in bad shape.

Tom

50
I don't have my books with me today, but I'm practically certain that Firmicus says something about no planet rejoicing in the 8th except the Moon in a nocturnal nativity. (This may reflect his notion of the Moon as weakening - associated the feminine principle).