ROME—Pope Francis will go to Turkey at the end of November after the Holy See received an official invitation, the Vatican said Friday, as he increases the number of foreign trips in his 18-month-old papacy.

"This morning the Holy See received a letter of invitation on behalf of the president of Turkey, Recep Tayyip Erdogan, for a visit by the pope to the country," said Vatican spokesman Rev. Federico Lombardi.

The Holy See is now working on the exact program of the trip, including its duration, Rev. Lombardi added.

On Thursday, the Vatican announced that Pope Francis will address the European Parliament in the French city of Strasbourg during a solemn session on Nov. 25.

The visit to Turkey will be the sixth international trip made by the Argentine-born pontiff since his election in March 2013, the first of a non-European in some 1,400 years.