CONFIRMING STATEMENT

This Statement confirms that the undersigned, John Brennan,
has authorized and designated each of Charles F. Cronin,
J. Kendall Huber, and Walter H. Stowell, acting singly, to execute
and file on the undersigned's behalf, individually and in the
undersigned's capacity as a trustee for various family trusts, all
Forms 3, 4 and 5 (including any amendments thereto) that the
undersigned may be required to file with the Securities and Exchange
Commission as a result of the undersigned's ownership of or
transactions in securities of The Hanover Insurance Group, Inc.
The authority of Charles F. Cronin, J. Kendall Huber, and
Walter H. Stowell under this Statement shall continue until the
undersigned is no longer required to file Forms 3, 4 and 5 with
regard to the undersigned's ownership of or transactions in the
securities of The Hanover Insurance Group, Inc., unless earlier
revoked in writing.  The undersigned acknowledges that
Charles F. Cronin, J. Kendall Huber, and Walter H. Stowell are not
assuming any of the undersigned's responsibilities to comply with
Section 16 of the Securities Exchange Act of 1934.

/s/ John Brennan
Dated: December 15, 2010