The Virgin with Christ Child, both holding their burning hearts. Woodcut. https://www.rawpixel.com/image/13975436/the-virgin-with-christ-child-both-holding-their-burning-hearts-woodcutFree Image from public domain license
Saint Barbara: she holds a burning heart before the Christ Child held by the Virgin. Engraving by G. Huret. https://www.rawpixel.com/image/13978900/image-heart-cartoon-faceFree Image from public domain license