Wasn’t sure if that was Latin or another Romance language with which I’m not as familiar (I thought maybe Portugese?) but, according to Google at least, that seems to be Latin. (And sorry about the random red line across the image.)
[taken from this site]
[first picture and quotes taken from this site; second picture labeled; third picture: my edits for legibility]
[note the typo in conjux; ouch to skip a letter in such a permanent medium]
To the memory of my most beloved wife Christine (?) / Christiana, whom, released by death in the 48th year of her life (up to the 48th year of her life) (March 27 (yes?), 1816), her grieving husband, George W. Chapman, a doctor, venerates with this marble inscription and attests to her virtues. May she rest in peace.
Latin Inscription [small, at bottom]:
Invenit et sculpsit Parisiis J. J. Cafierii sculptor regius anno domini MDCCLXXXII
[same inscription in two images; was hoping the B & W would make it a touch more legible]