five hundred livres a year
The French Livre was one of the main currencies used in this time period. The amount stated here was to emphasize that this man really was poor, especially in the court of the king, as there was some inflation going on around this time. The livre was roughly half the value that it used to be compared to the previous century.
O’Neill, E. Wesley. “French Coinage in History and Literature.” The French Review, vol. 39, no. 1, 1965, pp. 1–14. JSTOR, https://www.jstor.org/stable/385276?casa_token=wteaLnpGOmgAAAAA%3A7vFlaI2JZQM5vj_EKeXj-UE1lCO_ZWDiFHTgad_OOfkQeHBsEVB94Fad0OCAGrk55z77PDXBTB-NJ9chRp9P8YfytEVXoD40R1BdYQDUSb92nSXCuwVQ&seq=7. Accessed 26 Mar. 2025.