I just discovered Herodotus 5.39-41 due to the Rouse thread. Interesting things happening there 1) divorce is the first recommendation. 2) He sets up two wives in separate households (separate households being mentioned in the EoRandE article as the way that concubine-societies would conduct actual polygamy). 3) The second wife winds up having the children, leading to that age-old Sarah/Hagar dynamic.