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But didn't snakes evolve from something with legs? There are a number of snakes, specially historically with legs and some where the leg bones are still there.

Legless lizards and snakes some to convergent evolution. But its of course possible that other legless lizards existed before that.

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There are modern species of snakes with vestigial legs today, pythons, boas... Leglessness in lizards not very uncommon. It evolves regularly, before and after the snake lineage likely originates. One species of such creatures became the ancestor of snakes. I think (not an expert) that the lineage of that creature is still speculative... with a still-wide range of candidates.

Not sure if Plesiosaurs are still a contender, but if it is then it gives Plesiosaurs the same relationship to snakes that birds have to dinosaurs.

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