Ok guys! I’ve realized something!
Remember the 4x06 episode of TVD? While Shane is talking about Silas, there is a slide show behind him.
One of the images is a pic of the stone from the Silas’ tomb. It shows how the stone has a message written on it. And next to it there is an alphabet.
I’ve translated the message and it’s written in latin…
SILAS PRODITOTI DAMPNABER
SILAS DAMN TRAITOR