Attribution to the van Eyck brothers is supported by the small amount of surviving documentary evidence attached to the commission, and from Jan's signature and dating on a reverse frame. Jan seems to minimize his contribution in favor of his brother, who died six years before the work's completion in 1432. A less explicit indicator is their seeming portraits as the third and fourth horseman in the Just Judges panel. Ramsay Homa notes lettering in the central panel of the lower register that might be read as an early formation of what was to become van Eyck's well known signature, built around various formations of ("As I Can"), a pun on his full name; and lettering is found on the headdress of one of the prophets standing at the back of the grouping. It is written in Hebrew script that roughly translates into French as "Le chapeau ... orne de trois lettres herbraiques formant le mot Saboth", or more likely as "Yod, Feh, Aleph", which when transliterated represents Jan's initials, JvE.