We've had a few threads here discussing the older manuscript literature of Ireland. Often these manuscripts have side comments by the main writer or other writers. I thought it would be good to have a thread on this minor topic.
I'll start with a personal favourite recently discussed by the Celticist Dennis King (from Seattle) on his blog:
http://nimill.blogspot.ie/2012/07/fearg-ar-scriobhai.html
The scribe Tadhg Ua Ríoghbhardáin wrote the phrase "Mallacht dib fein" in the margin.
I'll translate Dennis' commentary:
I would like to find out who Tadhg Ua Ríoghbhardáin was thinking of when he wrote that! I also love the calligraphy and the contractions. He wrote his name ([Manuscript] 3 B 23 at the RIA) on another page.
Although there is an archaic flavour and a little innocence in the phrase "Mallacht daoibh féin" as understood in Modern Irish, it wasn't as quaint in the 15th century when this scribe was alive. "Fúck yez too" is the translation into Modern English that I prefer, unless I'm mistaken!