Cú Chulainn is an Irish mythological hero who appears in the stories of the Ulster Cycle, as well as in Scottish and Manx folklore. You got to know that Celtic mythology is one of my favourite book genres, standing only one step below comics, biographies, and Czech self-introspective novels, but at least a couple of step above historical fictions, mystery, and Greek mythology.
Now, Cú Chulainn is one of the most complicated characters of Irish mythology. The son of the god Lugh and Deichtine, his childhood name was Sétanta, which today is the name of the main sport TV channel in Ireland. It is still about fun.
For many, Sétanta/Cú Chulainn resembles Achilles. As for Achilles, it was prophesied that his great deeds would give him everlasting fame but that his life would be a short one. I would encourage you to go and check out his full story which, as all the other Celtic tales, is incredibly long and spans over different centuries.
I remember Cú Chulainn now because I think of him every time I drink Bushmills; and we have finished the bottle of Bushmills we had at home. Since way back.