I'm curious as to historical norms for polygamous marriage, and it's hard to find sources. Here's a page about polygamy in the New Testament, but it focuses more on the religious/moral issues than on information about how polygamy worked.
For instance, are two women who are married to the same man considered to be each others' "wives", or sisters-in-law, or what? If the man dies is there any persisting relationship or obligation between the women? Depending on the culture and the laws of inheritance, if one wife or child inherits does she or he have to support the children of the other wife? Based on the longer life spans of women I imagine these situations were quite common. I bet it varied from culture to culture, but if anyone has any links I'd appreciate it.
(I'm told that my earlier post on polyamory is amusing.)