The nuncio serves both as the ambassador of the Holy See to the State of Libya and as delegate and point-of-contact between the Catholic hierarchy in Morocco and the pope.
The Vatican established the position of Delegate to Northern Africa in 1965; John Gordon held that post until 19 August 1967.
The delegate's responsibilities were modified as the Holy See developed relationships with countries in the delegate's area of responsibility.
Portalupi took on the titles of Pro-Nuncio to Algeria and to Tunisia in 1972.
He added the title Pro-Nuncio to Morocco on 5 March 1976.