Simplify the following text for a Grade 14 native English-speaking person.
Original: Desiderius Erasmus Roterodamus ( sometimes known as Desiderius Erasmus of Rotterdam ) ( October 27 , probably 1466 â `` July 12 , 1536 ) was a Dutch humanist , theologian and philosopher .
Simplified: Desiderius Erasmus Roterodamus ( October 28 , 1466 â `` July 12 , 1536 ) , sometimes known as Desiderius Erasmus of Rotterdam , was a Dutch Renaissance humanist , Catholic priest , and a theologian .