Isaac Butt died in 1879.

Isaac Batt was born in 1725.

no he takes it up the butt and holds up cardboard signs for spare change and slim jims

Well from approximately 1878, when the method of obstruction really came into play, Parnell would be considered the face of Irish nationalism. But you can't really say that at any specific point that Parnell succeeded him. Isaac Butt died in the May of 1879, before then the Home rule association had appointed Parnell as its head. But this was the association of Home Rule in England which was largely fenian and it was NOT the political party.

In the technical sense Parnell never succeeded Butt. But in the minds and image of Irish nationalism he would have overtaken him during 1878 with the obstructionism campaign.

butt butt butt butt butt butt