Masaccio, the Italian Renaissance master, has a painting called the Holy Trinity. In the bottom part of the painting, is a cadaver tomb, with an inscription. I have been able to find plenty of sources translating the inscription, but no source anywhere mentions what language the inscription is in. I'm assuming latin, but it could just as likely be Italian as well. Can anyone tell me what language the inscription is in?
Here's a link that describes the painting and the inscription: Holy Trinity Fresco by Masaccio (Wikipedia).
Here's the inscription:
IO FU[I] G[I]A QUEL CHE VOI S[I]ETE E QUEL CH['] I[O] SONO VO[I] A[N]C[OR] SARETE
Apparently, this inscription translates to:
I once was what you are and what I am you also will be
Why are there square brackets around certain letters when people write out the inscription?