Which Irish writer had the middle names Fingal O'Flahertie Wills?

I just read a giant book about Mr Wilde. He sure loved his fellow man.

He was awesome. I love his works. He was a clever man. "The only difference between the saint and the sinner is that every saint has a past, and every sinner has a future."

Oscar Wilde was an exceptional writer but here you've given details of the man I never read about. Thank you so much...