For two years, until the death of the king in September 1632, Yacob remained in the cave as a hermit, visiting only the nearby market to get food. In the cave, he developed his new, rationalist philosophy. He believed in the supremacy of reason, and that all humans – male and female – are created equal. He argued against slavery, critiqued all established religions and doctrines, and combined these views with a personal belief in a theistic Creator, reasoning that the world’s order makes that the most rational option.

And Amo:

Amo matriculated at the University of Halle in 1727, and became well-respected in German academic circles of the time, holding lecturing positions both at the universities of Halle and Jena.

Also interesting to note the international faculty at the University of Halle, "The Arab teacher Salomon Negri of Damascus and the Indian Soltan Gün Achmet from Ahmedabad were others who arrived in Halle to study and teach."