The slate was found on the island at Tintagel in 1998. I believe it reads
- MAV E[IGIR]
- COLI AVI FICIT
- ARTOR GNOV
- COLI [AVI]
where the bracketed letters are now missing and some of the words run together. A cross occupies the space between lines one and three.
The letters in the first line are in larger characters. They are not easy to identify and their interpretation has changed since the slate’s discovery. The M and A are ligatured with the start of the letter M being only just visible. The text below the cross occupies five lines and the script is smaller. The lefthand diagonal descender of the letter V in the third line is just about visible. Also, what has thus far been interpreted as a G on the fifth line is in reality an R and G ligatured as illustrated below.
The inscription is clearly Arthurian as indicated by the following interpretation. The text in lines one to four form a sentence which is repeated in lines five to seven, but with the matronymic missing and the name Paternus replaced by Artor. This suggests that Paternus is an alternative name for Artor. The slate thus reads:
The son of Igraine, Paternus, made this for his grandfather Coel.
The renowned Arthur made this for his grandfather Coel.
We thus have an inscription with an interesting mix of Brythonic and Latin text.