adjective/i.lystʁ/
illustrious
“À Florence, riche et fameuse ville d’Italie, dans la province qu’on appelle Toscane, vivaient deux gentilshommes d’illustre famille, Anselme et Lothaire....” — In Florence, a rich and famous city of Italy, in the province called Tuscany, lived two gentlemen of illustrious family, Anselmo and Lothario....
Related: illustre inconnu
From Latin illustris (“bright, shining, brilliant, lustrous; clear, lucid; illustrious, distinguished, famous”), from illūstrō (“to illustrate”).