ACT II SCENE 9: Who is the young Venetian that has arrived?

MESSENGER Madam, there is alighted at your gate A young Venetian, one that comes before To signify th' approaching of his lord, From whom he bringeth sensible regreets, To wit—besides commends and courteous breath— Gifts of rich value. Yet I have not seen So likely an ambassador of love. A day in April never came so sweet To show how costly summer was at hand, As this forespurrer comes before his lord.