POWER OF ATTORNEY

FOR SECTION 16 REPORTING OBLIGATIONS

      Know all by these presents, that the undersigned hereby constitutes and appoints each of

Christopher K. Dalrymple and Stela Burghart, or either of them acting singly and with full power

of substitution, the undersigned's true and lawful attorney-in-fact to:

(1) execute for and on behalf of the undersigned, in the undersigned's capacity as a

director or officer of Alleghany Corporation (the "Corporation"), Forms 3, 4, and

5 (including any amendments thereto) in accordance with Section 16(a) of the

Securities Exchange Act of 1934, as amended (the "Exchange Act"), and the rules

thereunder;

(2) do and perform any and all acts for and on behalf of the undersigned which may

be necessary or desirable to complete and execute any such Form 3, 4, or 5

(including any amendments thereto), and timely file such form with the United

States Securities and Exchange Commission (the "SEC") and any securities

exchange or similar authority, including without limitation the filing of a Form ID

or any other documents necessary or appropriate to enable the undersigned to file

the Forms 3, 4, or 5 electronically with the SEC; and

(3) take any other action of any type whatsoever in connection with the foregoing

which, in the opinion of such attorney-in-fact, may be of benefit to, in the best

interest of, or legally required by or for, the undersigned, it being understood that

the documents executed by such attorney-in-fact on behalf of the undersigned

pursuant to this Power of Attorney shall be in such form and shall contain such

information and disclosure as such attorney-in-fact may approve in such attorney-

in-fact's discretion.

      The undersigned hereby grants to each such attorney-in-fact full power and authority to

do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done

in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes

as the undersigned might or could do if personally present, with full power of substitution or

revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney in

fact's substitute or substitutes, shall lawfully do or cause to be done by virtue of this Power of

Attorney and the rights and powers herein granted.  The undersigned acknowledges that the

foregoing attorneys-in-fact, in serving in such capacity at the request and on behalf of the

undersigned, are not assuming, nor is the Corporation assuming, any of the undersigned's

responsibilities to comply with, or any liability for the failure to comply with, any provision of

Section 16 of the Exchange Act.

      This Power of Attorney shall remain in full force and effect until the undersigned is no

longer required to file Forms 3, 4, and 5 with respect to the undersigned's holdings of and

transactions in securities issued by the Corporation, unless earlier revoked by the undersigned in

a signed writing delivered to each of the foregoing attorneys-in-fact.



      IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be

executed as of this 21st day of June, 2017.









Name:

/s/ Joseph P. Brandon



    Joseph P. Brandon