That's a pretty presentist* view of historical people. Every historical group has lived on a microscale. There would be daily things that would make you laugh, cry, rage. Even the poorest would smile when their baby did something silly during dinner time. There's plenty of art and written heritage that proves this.

Edit: changed modernist to presentist.

> Presentism is rife. We're quite smug with our modern judgments.

...and you provided a nice example of it.

You're assuming that she's basing her happiness on a modern scale. If being a medieval peasant is all she knows, that's going to frame her perceptions.

Happiness is relative.

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