Rare book

Have fragile very old book brought over by my grandad to states 1866, been in our fam forever. Written in ancient Gaelic, no one seems to be able to translate. One person thought it belonged to Aindrias MacCraith, 1740 poet from Croom, my grandad was from Louth maybe Dundalk. Very fragile. Any ideas who could even trans it? Asked Trinity college , they tried, but nada. Thanks