Saliba or Sliba ibn Yuhanna (Arabic: Ṣalībā ibn Yūḥannā) was a medieval Syriac Christian, author of a 1332 Arabic compendium known as The Books of Secrets (Asfar al-Asrar).
204 is a likely autograph, where ibn Yuhanna copied texts that interested him.
The manuscript is internally dated to June 1315 and placed in Jazīrat Ibn ʿUmar.
Ibn Yuhanna's "Book of Secrets" opens with a letter addressed to the Christians in the "West" (Byzantine Empire), defending the authenticity of the Church of the East and making a plea for Christian unity.
It is plausible that ibn Yuhanna was already in Cyprus, at the time still a crusader kingdom (under king Hugh IV) when he completed this work.