There once was a Druid who traveled through time.
He lived to be myth and created Naill’s Nine.
He fought quite a war,
He’s sometimes a boar
Now that he spends his days in this head of mine.
Despite writing a book about time travel, I couldn’t find a passage I didn’t have to edit down to fit this prompt. So, here’s a limerick about Dubh Súile (AKA D). I’m sure he’ll take me to task for it later.