pg. 8 I guess it's my fault for knowing these things, but historically no European noblewoman could marry a illegitimate son and few would want to since nobility passed through a legitimate father.
For the same reason, acknowledged illegitimate daughters, particularly with a large dowry, had an easier time marrying into the same level of nobility or lower, sometimes into a rich gentry family that needed noble connections.
This true love, I hope he thinks I'm hot, is just modern bullshit.