theophilus presbyter teriminin İngilizce İngilizce sözlükte anlamı
pseudonym of Roger of Helmarshausen flourished 12th century German monk and writer. He is known for his De Diversis Artibus ( 1110-40), a thorough account of the techniques of almost all the known crafts of the early 12th century. From his writings it can be deduced that he was a practicing craftsman of the Benedictine order