Wiktionary
celestines
n. (plural of Celestine English)
Wikipedia
Celestines
Celestines were a Roman Catholic monastic order, a branch of the Benedictines, founded in 1244. At the foundation of the new rule, they were called Hermits of St Damiano, or Moronites (or Murronites), and did not assume the appellation of Celestines until after the election of their founder, Peter of Morone (Pietro Murrone), to the Papacy as Celestine V. They use the post-nominal initials O.S.B. Cel.