France has finally returned 23 Syrian archaeological treasures that remained in the country for about 15 years after being loaned for an exhibition. Their return coincided with French President Emmanuel Macron’s landmark visit to Damascus.

The artifacts, flown aboard Macron’s presidential aircraft on Tuesday and returned to Syria’s National Museum, include Roman bronze objects, Byzantine and Islamic-era pieces and a richly colored mosaic panel that once adorned the Umayyad Mosque. The collection was loaned in 2011 to an exhibition of Syrian antiquities at the Arab World Institute in Paris.

The Syrian Foreign Ministry said that the artifacts belonged to museums in Damascus, Aleppo, Latakia and Palmyra and remained in France after diplomatic ties between the two countries were severed under Assad’s rule. It described France as the first country to cooperate with Syria under a national campaign to recover antiquities held abroad.

"Today we are unveiling a selection of archaeological artifacts that have been returned to Syria,” said Ayman al-Nabo, deputy director-general of Syria’s Directorate-General of Antiquities and Museums, at the opening of an exhibition at the National Museum in Damascus featuring two of the returned pieces.