The oath of Henri de Guise: he and his mother look at a painting of the assassination of his father, and vow revenge. Wood engraving by H. Linton after H. Rousseau after P.-C. Comte, 1864.

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The oath of Henri de Guise: he and his mother look at a painting of the assassination of his father, and vow revenge. Wood engraving by H. Linton after H. Rousseau after P.-C. Comte, 1864. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.