CONFIRMING STATEMENT


    This Statement confirms that the undersigned has authorized and designated Richard R.
Grinnan, Anne G. Waleski, Karl M. Strait, Anna M. King, or Donna L. Strauss (each an
"Authorized Signer") to execute and file (in any permitted format) on the undersigned's behalf all
Forms 3, 4 and 5 (including any amendments thereto) that the undersigned may be required to
file with the United States Securities and Exchange Commission as a result of the undersigned's
ownership of, or transactions in, securities of Markel Corporation.  Any such previous
authorization is hereby revoked.  Each Authorized Signer is authorized to obtain CIK and
EDGAR access codes and take all such other actions as may be necessary or desirable to permit
electronic filings of such forms.  The authority of each Authorized Signer under this Statement
shall continue until the undersigned is no longer required to file Forms 3, 4 or 5 with regard to
the undersigned's ownership of, or transactions in, securities of Markel Corporation, unless
earlier revoked in writing.  The undersigned acknowledges that none of the Authorized Signers
or Markel Corporation is assuming any of the undersigned's responsibilities to comply with
Section 16 of the Securities Exchange Act of 1934.

Date:  February 24, 2015


                            /s/ Stewart M. Kasen
                            Signature

                            Stewart M. Kasen
                            Printed Name