Portuguese naming practices
I've been reading a book titled OVER THE EDGE OF THE WORLD by Laurence Bergreen, it's the history of Ferdinand Magellan, the Portuguese Navigator or Fernao de Magalhaes who was said to have been born around 1480 in the Parish of Sabrosa in northwestern Portugal. His lineage can be traced through his father Rodrigo de Magalhaes who could trace his heritage back to the 11th century to a French crusader, De Magalhaes. Rodrigo qualified as minor Portuguese nobility.