Roman epigraphy specialists recognised the message, found at the Roman site of Vindolanda, as a mangled version of the words Secundinus cacator, which translates into English as “Secundinus, the shitter”.
They believe the phallic image alongside it added “to the force of the written insult”.
“Only after we removed the mud did I realise the full extent of what I’d uncovered, and I was absolutely delighted.”
https://www.bbc.com/news/uk-england-tyne-61594029