Many of these people are women. How did they get their income and/or estates?
Was marrying for wealth as much a priority for aristocrats as it can sometimes seem from these works?
Hi, you'll find more discussion in this post, which includes links to a few more
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Normally, that phrase was used to mean that "at least X pounds per year" was their annual income. It could have been from trade, from inheritance, or more usually from the land. I can't comment specifically about the women or the "marrying for wealth", but that is what the phrase was used to mean.