BOSTON (WBZ-AM) -- Do you recognize this man? His identity is an SJC mystery.

His oil painting portrait is part of the Massachusetts Supreme Judicial Court's collection of paintings and photographs, but nobody there knows his name.

It is believed the justice may have sat on the bench between 1780 and 1820.

"Efforts have been made periodically within the SJC to identify the subject of the portrait from at least 2005 when we were re-hanging all the portraits in the John Adams Courthouse," SJC Public Information Officer Jennifer Donahue wrote in a release.

Now, SJC Chief Justice Ralph Gants is asking the public for information about the portrait, which hangs outside his office.

If anybody can help positively and authentically identify the unknown justice, they'll be invited to stand with Chief Justice Gants as he places a plaque identifying him--and be given a guided tour of the John Adams Courthouse after.