The Nativity and the Escape in Egypt from a private collection: interdisciplinary study around twoun published wings of a dismembered triptych from the entourage of Pieter Coecke d’Aelst. The two panels of the Nativity and the Escape of the Holy Family in Egypt from a Belgian private collection are the unpublished components of a triptych of The Adoration of the Magi whose central panel has now disappeared. The comparison of the Nativity with the left wing of the triptych of the collection Hester Diamond by Pieter Coecke d’Aelst or the Master of 1518 allows us to consider the entirety of the original composition to which belang the panel of the private collection. In 1966, Georges Marlier highlighted two types of triptych of The Adoration of the Magi with different scenes on the shutters in the Master of 1518 and Pieter Coecke d’Aelst, thus laying the foundations for this production. Triptychs representing both the Nativity and the Escape in Egypt on the shutters are nevertheless rarer and the only known examples are currently all attributed to the workshop or the entourage of Pieter Coecke d’Aelst.