Early Christian memorial stone

Early Christian memorial stone
christian dating
Image by tigerweet
One of four (two of the others are overgrown this time of the year, the other one wasn’t as impressive) early Christian memorial stones, dating between the 5th and 7th century AD. This one has lost its top and, according to my 1982 leaflet by D.B. Hague, says

..ITERNI
..ITIGERNI

"The root word ‘Terni’ is a Celtic one meaning ‘Lord’… It might have read ‘The stone of’ (this is implied) of Conigernos ‘The son of Tigernos’.