Exhibit 3.1

                             Chapman and Cutler LLP
                                 111 West Monroe
                             Chicago, Illinois 60603


                                   May 1, 2008


Claymore Securities, Inc.
2455 Corporate West Drive
Lisle, Illinois  60532


             Re: Claymore Securities Defined Portfolios, Series 477
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Ladies and Gentlemen:

   We have served as counsel to Claymore Securities Defined Portfolios, Series
477 (hereinafter referred to as the "Fund"), in connection with the issuance,
under the Reference Trust Agreement dated the date hereof between Claymore
Securities, Inc., as Depositor, and The Bank of New York, as Trustee, of Units
of fractional undivided interest in the one or more Trusts of said Fund
(hereinafter referred to as the "Units").

   In connection therewith, we have examined such pertinent records and
documents and matters of law as we have deemed necessary in order to enable us
to express the opinions hereinafter set forth.

   Based upon the foregoing, we are of the opinion that:

     1.   The execution and delivery of the Reference Trust Agreement and the
          establishment of book entry positions evidencing the Units in the
          Trust(s) of the Fund have been duly authorized; and

     2.   The book entry positions evidencing the Units in the Trust(s) of the
          Fund when duly established in accordance with the aforementioned
          Reference Trust Agreement, will constitute valid and binding
          obligations of such Trust(s) and the Depositor in accordance with the
          terms thereof.

   We hereby consent to the filing of this opinion as an exhibit to the
Registration Statement (File No. 333-149103) relating to the Units referred to
above and to the use of our name and to the reference to our firm in said
Registration Statement and in the related Prospectus.

                                                         Respectfully submitted,

                                                      /s/ Chapman and Cutler LLP
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                                                          Chapman and Cutler LLP