One other thing: if you want a number of rebel heroes to appear in the same province at the beginning, you need to give them different ages. I discovered this when trying to set up heroes for three brothers in one province. I started with them all the same age, but only the first two names were used, the third hero came out with a repeat of the second name. I rejigged it so they were a year apart and LO! all three heroes cropped up.

And faction heroes can also appear leading loyalist rebellions, which can be fun