Diptych can refer to two paintings that are joined together.
Conrad von Soest:
St. Dorothea (diptych), c. 1420. Westphalian State Museum,
Münster
Conrad von Soest,
St. Odilia (diptych), c. 1420. Westphalian State Museum,
Münster
Stefan Lochner:
Adoration of the Christ Child by the Virgin (The Nativity) (diptych), c. 1445s. Alte Pinakothek,
Münich
Stefan Lochner,
Presentation at the Temple (diptych), c. 1447 Calouste Gulbenkian Museum,
Lisbon
The dead Lovers[Musée des Beaux-Arts de Strasbourg]