CONFIRMING STATEMENT


This Statement confirms that the undersigned has authorized and designated D. Michael
Jones, Anne G. Waleski, Richard R. Grinnan, 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 are assuming any of the undersigned's responsibilities to
comply with Section 16 of the Securities Exchange Act of 1934.


Date: February 19, 2013					/s/ Stewart M. Kasen
							Signature

							Stewart M. Kasen
							Print Name