The book includes integral citations of the Esmerald Table (Jabber Ibn Hayyam, the main reference for alchemy) and a rough, well-constructed critic of kings by God's right, 150 years before Dennis Diderot. Diego de Haedo, the declared authr, was only Archibishop of Palermo, the very same one that charged Leon Africanus as the Inquisitor in Sicilia. In Topography... Leon Africanus is amplialy cited, as a main reference. Also, as references, you can find the german cosmograph Sebastian Munster, friend of Luther, or Galatinos, a Roman Kabbalist monk, and Johannes Deirdo, a belgian friend of Luther or even Lorenzo Valla, an humanist tuscan philosopher still held prisonner in Vaticano's library. I think people that pretend Topography and General History of Algiers was written by a catholic lettered simply didn't read it, or read the 1870 censored French version. Please show us the objective proofs this book had been written by a "catholic lettered".