INSURED MUNICIPALS INCOME TRUST 121ST INSURED MULTI SERIES, 485BPOS, EX-99.1.1, 2000-09-25

INSURED MUNICIPALS INCOME TRUST 121ST INSURED MULTI SERIES
485BPOS, EX-99.1.1, 2000-09-25

Previous: INSURED MUNICIPALS INCOME TRUST 121ST INSURED MULTI SERIES, 485BPOS, 2000-09-25

Next: VANGUARD ADMIRAL FUNDS INC, N-30D, 2000-09-25



<PAGE>


               Consent of Independent Certified Public Accountants

     We have issued our report dated July 14, 2000 accompanying the financial
statements of Insured Municipals Income Trust, 121st Insured Multi-Series as of
May 31, 2000, and for the period then ended, contained in this Post-Effective
Amendment No. 8 to Form S-6.

     We consent to the use of the aforementioned report in the Post-Effective
Amendment and to the use of our name as it appears under the caption "Auditors".

                                                              Grant Thornton LLP




Chicago, Illinois
September 25, 2000