or Arnulph, bishop of Rochester in the reign of Henry I. He was born in France, where he lived some time a monk in the monastery of St Lucien de Beauvais. The irregular lives of the monks determined him to quit their society, and on the invitation of his former prior Lanfranc, archbishop of Canterbury, he removed to England, and took up his abode in the monastery of Canterbury. After the death of Lanfranc, Arnulph was made prior of the monastery of Canterbury, and afterwards abbot of Peterborough. In 1115 he was consecrated bishop of Rochester, which see he held nine years, and died in March 1124, aged 84. Arnulph wrote in Latin an account of the foundation, endowment, charters, laws, &c., of the church of Rochester: it is known by the title of Textus Roffensis, and is preserved in the archives of the cathedral of Rochester. It has been printed in Thorpe's Registrum Roffense.