The message was in the following words: "Reddo gratias, Illustrissimi Domini, ob honores tanto nimios quanto immeritos!
From Illustrissimi philosophi et theologi domini Alberti magni compendiosum insigne ac perutile opus Philosophiae naturalis, Venice, 1496, showing the ventricles of the brain.
On the second of these folios is pasted a square slip of paper bearing Gloucester's arms, roughly executed, and the inscription 'Ex dono illustrissimiprincipis et domini.
Est illustrissimi domini ducis Gloucestrensis,' which shows that the volume was written for Gloucester himself.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "illustrissimi" in a variety of sentences. We hope that you will now be able to make sentences using this word.