46. Van Gogh is most likely referring here to the passage (telling of the eagle above Numa’s head) in Livy,
Ab urbe condita,
i, 34, 8. See
Livy (‘Ab urbe condita’). Ed. B.O. Foster. Vol. 1. London and New York 1919, p. 125 (
LCL). Livy, book
i, was widely used in the instruction of latin. Cf. also Otto Keller,
Die antike Tierwelt. 2 vols. Leipzig 1909-1913, vol. 2, p. 3.