<SEC-DOCUMENT>0001096343-16-000221.txt : 20160401
<SEC-HEADER>0001096343-16-000221.hdr.sgml : 20160401
<ACCEPTANCE-DATETIME>20160401163142
ACCESSION NUMBER:		0001096343-16-000221
CONFORMED SUBMISSION TYPE:	4/A
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20160222
FILED AS OF DATE:		20160401
DATE AS OF CHANGE:		20160401

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MARKEL CORP
		CENTRAL INDEX KEY:			0001096343
		STANDARD INDUSTRIAL CLASSIFICATION:	FIRE, MARINE & CASUALTY INSURANCE [6331]
		IRS NUMBER:				541959284
		STATE OF INCORPORATION:			VA
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		4521 HIGHWOODS PARKWAY
		CITY:			GLEN ALLEN
		STATE:			VA
		ZIP:			23060-3382
		BUSINESS PHONE:		8047470136

	MAIL ADDRESS:	
		STREET 1:		4521 HIGHWOODS PKWY
		CITY:			GLEN ALLEN
		STATE:			VA
		ZIP:			23060

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MARKEL HOLDINGS INC
		DATE OF NAME CHANGE:	19991005

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Glisson Britton L.
		CENTRAL INDEX KEY:			0001454630

	FILING VALUES:
		FORM TYPE:		4/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15811
		FILM NUMBER:		161547657

	MAIL ADDRESS:	
		STREET 1:		C/O MARKEL CORPORATION
		STREET 2:		4521 HIGHWOODS PARKWAY
		CITY:			GLEN ALLEN
		STATE:			VA
		ZIP:			23060
</SEC-HEADER>
<DOCUMENT>
<TYPE>4/A
<SEQUENCE>1
<FILENAME>wf-form4a_145954269076225.xml
<DESCRIPTION>FORM 4/A
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4/A</documentType>

    <periodOfReport>2016-02-22</periodOfReport>

    <dateOfOriginalSubmission>2016-02-24</dateOfOriginalSubmission>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001096343</issuerCik>
        <issuerName>MARKEL CORP</issuerName>
        <issuerTradingSymbol>MKL</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001454630</rptOwnerCik>
            <rptOwnerName>Glisson Britton L.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O MARKEL CORPORATION</rptOwnerStreet1>
            <rptOwnerStreet2>4521 HIGHWOODS PARKWAY</rptOwnerStreet2>
            <rptOwnerCity>GLEN ALLEN</rptOwnerCity>
            <rptOwnerState>VA</rptOwnerState>
            <rptOwnerZipCode>23060</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>Chf Admin Off-Pres Global Ins</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2016-02-22</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>A</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>429</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                </transactionShares>
                <transactionPricePerShare>
                    <value>0</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>12314.732</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">Restricted stock units awarded pursuant to the Markel Corporation 2012 Equity Incentive Compensation Plan that will vest, subject to certain conditions, on December 31, 2018.</footnote>
        <footnote id="F2">This amendment is being filed to correct an administrative rounding error in the number of shares awarded to the Reporting Person in the original Form 4.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Donna L. Strauss, Attorney-in-fact for Britton L. Glisson</signatureName>
        <signatureDate>2016-04-01</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>a2016february23-confirming.htm
<DESCRIPTION>GLISSON POA 02232016
<TEXT>
<!-- Document created using Workiva -->
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<pre>
CONFIRMING STATEMENT


    This Statement confirms that the undersigned has authorized and designated Richard R. Grinnan, Anne G. Waleski, Karl M. Strait, Anna M. King, Alex K. Tinucci 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 23, 2016


    /s/ Britton L. Glisson
    Signature

    Britton L. Glisson
    Printed Name
</pre>
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</SEC-DOCUMENT>
