Richard III and a Wandering Wife

This is an old story - either almost a year and a half, or several hundred years - about evidence of infidelity in Richard III's family.

The instance of female infidelity, or cuckolding, could have occurred anywhere in the numerous generations separating Richard III from the 5th Duke of Beaufort (1744-1803), whose living descendants provided samples of male-line DNA to be compared against that of Richard.

A bored or lonely wife is the most logical explanation, but I like to think of a Sommersby-like reason for it. Obviously this would be very unlikely, nobility are too well-known for this kind of switch, but I like the idea of a mean, abusive man going off to war and a kind, loving one coming home. It's a more interesting story than intentional infidelity.