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In page Jael:

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Medieval images of Jael, mostly in illuminated manuscripts, depicted her as both a defender of Israel and a prefiguration of the Virgin Mary.[1] This can be seen in the Stavelot Bible, the Speculus Darmstadt, as well as several other texts. When not shown in the act of killing Sisera, she carries her hammer and sometimes the spike, making her easy to identify.[citation needed]