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 Libya and the pope.
The Vatican established the position of Delegate to Northern Africa in 1965; John Gordon held that post until 19 August 1967.
Portalupi took on the titles of Pro-Nuncio to Algeria and to Tunisia in 1972.
When he added the title Pro-Nuncio to Morocco on 5 March 1976, his role as Delegate to North Africa was left with responsibility for Libya alone and he became Delegate to Libya.
[1] The title Apostolic Nuncio to Libya is held by the prelate appointed Apostolic Nuncio to Malta; he resides in Malta.