<PAGE>
SUPPLEMENT DATED OCTOBER 15, 1998
TO PROSPECTUS DATED MAY 1, 1998
FOR GRANDMASTER III FLEXIBLE PREMIUM VARIABLE ANNUITY
ISSUED BY NATIONAL INTEGRITY LIFE INSURANCE COMPANY
THIS SUPPLEMENT MODIFIES THE PROSPECTUS AND SHOULD BE
READ AND RETAINED WITH THE PROSPECTUS.
On page 17, the second paragraph under the heading CONTINGENT WITHDRAWAL CHARGE
is deleted, and replaced by the following:
During any contract year, no charge will be applied to your partial
withdrawals that do not exceed the free withdrawal amount. On any Business
Day, the free withdrawal amount is 10% of your Account Value less
withdrawals during the current contract year. If any partial withdrawal
exceeds the free withdrawal amount, we will deduct the applicable
contingent withdrawal charge with respect to such excess amount. The
contingent withdrawal charge is a sales charge to defray our costs of
selling and promoting the contracts. We do not expect that revenues from
contingent withdrawal charges will cover all of such costs. Any shortfall
will be made up from our General Account assets, including any profits from
other charges under the contracts.
