As a young man, he participated in the compilation of the Annals of the Four Masters, working with Mícheál Ó Cléirigh, Cú Choigcríche Ó Cléirigh, Peregrine Ó Duibhgeannain and other assistants.
Peregrine Falcon | Peter N. Peregrine | The Adventures of Peregrine Pickle | Peregrine Worsthorne | Peregrine Maitland | Peregrine falcon | Title page of the first edition of ''The Adventures of Peregrine Pickle | Peregrine Ó Duibhgeannain | peregrine falcon | Peregrine Eliot, 10th Earl of St Germans | Ó Duibhgeannáin | Peregrine Systems | Peregrine Moncreiffe of that Ilk | Peregrine Financial Group | (peregrine) falcon | Peregrine Bertie, 3rd Duke of Ancaster and Kesteven |