St John Altarpiece (Memling) similar Memling work is the "" held at the Louvre, which Georges Hulin de Loo determined to have been completed earlier than the "St John Altarpiece" and the New York panel. The "Cellier Diptych" has the Virgin and Child in an enclosed garden with the same two Saints Catherine and Barbara on the left-hand panel. The composition is remarkably similar to the New York panel and the altarpiece, with the Virgin on her throne and St Catherine and St Barbara positioned to form a triangle. The "Cellier Diptych" includes four additional female saints (with attributes) sitting around the Virgin: St
Saint Peter Martyr Altarpiece testimony) also mention a second altarpiece by the artist in the same church, also dating to 1476, now known as the "Saint Peter Martyr Altarpiece"'. It is therefore theorised that the altarpieces were both dismantled during rebuilding of the church in 1776, then sold to the antiquarian Grossi who sold all the panels separately and grouped some of them into the altarpiece that Cardinal Zelada bought from him. Federico Zeri and Rodolfo Pallucchini then joined the altarpieces together, initially referring to the first (the high altarpiece), the "Pietà" in the Metropolitan Museum, and then to the "Madonna" in the Museum