Rob Graces reconstruction of a Dragoon standard captured at Marston Moor, described in Captain William Stewart's  A Full Relation of the Late Victory thus:

A white Coronet of dragoones with a blew and white fringe in the midst of whereof is painted a roundhead face, and on its top the letter P. (which is conceived to signifie a Puritan) with a sword in a hand reaching from a cloud, with this mott, FIAT IUSTITIA. (Let Justice be Done).