"The 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 ...
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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 used the post-nominal initials O.S.B. Cel. The order was absorbed by Order of the Most Holy Annunciation from 1778 by order of Pius VI in 1776. In 1810 the last Celestines were transferred." - (en.wikipedia.org 15.02.2020)