one of the Slaney", a family formerly powerful in the Upper Woods area of modern County Laois.

He is known for his association with St John's Priory, Kilkenny; around 1200 he granted the tithes of Kilkenny Castle to Brother Osbert, the Prior of Saint John's Hospital, allowing them to develop the Augustinian abbey.

[3] He moved the see from Aghaboe Abbey to St Canice's Cathedral, Kilkenny, due to war in the Leinster region.

[4] Felix was unafraid of the powerful Norman lords, excommunicating Theobald Walter, 1st Chief Butler of Ireland when he usurped Church land.

[11] He is commonly referred to as "Blessed Felix O'Dullany", a title in Catholicism applied to a person who is believed to have entered into Heaven and have the capacity to intercede on behalf of individuals who pray in his or her name.