Despite the reverent inscription, the headstone was forgotten in the departures area of Terminal One several years ago.
Other unorthodox lost and found discoveries include a toilet, a life-size mannequin, human ashes, false teeth and a glass eye.
Dublin Airport Authority spokeswoman Audrey O'Hagen said many passengers attempt to bring pets through security, which in one case resulted in the pet being left behind.
"Just two weeks ago, somebody tried to bring a goldfish, so they had a goldfish in a two litre bottle of water they wanted to take away with them," O'Hagen told Dublin's 98FM radio station. "They couldn't, so believe it or not, that fish has since been re-homed by a staff member here and it's in their fish pond in Malahide."
O'Hagen added that any lost items can be claimed by filing a report on the DAA's website.
"You can log it online using an online form and if you're looking to see if your item has arrived into lost property, we update that website or you can email [email protected]," she said.