The 'crown' is the top of the head.
The crown is the top of the head, or the whole head.
The top part of the skull; the top of the head.
the top part of a head
From toe to crown he'll fill our skins with pinches,
Shakespeare - The Tempest IV, 1 - 1,972
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Citation from 1535 :
So wente Sathan forth from the LORDE, and smote Iob with maruelous sore byles, from the sole off the fote vnto his crowne: