This is supposed by Kloss (Bibliographie der Freimaurerei, Nos. 2442, 2497, etc.) to have been a nom-de-plume or pen name of Gotthardus Arthusius, a co-rector in the Gymnasium of Frankfort-on-the-Main, and a writer of some local celebrity in the beginning of the seventeenth century (see Arthusius).

Under this assumed name of Irenaeus Agnostus, he published, between the years 1617 and 1620, many works on the subject of the Rosicrucian Fraternity, which John Valentine Andrea had about that time established in Germany. Among those works were the following:

• Fortaliciuni Scientiae, 1617
• Clypeum Veritatis, 1618
• Speculum Constantiae, 1618
• Fons Gratiae, 1619
• Frater non Frater, 1619
• Thesaurus Fidei, 1619
• Portus Tranquillitatis, 1620

And several others of a similar character and equally quaint title.