<SEC-DOCUMENT>0001096343-21-000184.txt : 20211209
<SEC-HEADER>0001096343-21-000184.hdr.sgml : 20211209
<ACCEPTANCE-DATETIME>20211209164630
ACCESSION NUMBER:		0001096343-21-000184
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20211207
FILED AS OF DATE:		20211209
DATE AS OF CHANGE:		20211209

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			COX ROBERT C
		CENTRAL INDEX KEY:			0001242382

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-15811
		FILM NUMBER:		211482492

	MAIL ADDRESS:	
		STREET 1:		3 MOUNTAIN VIEW RD
		CITY:			WARREN
		STATE:			NJ
		ZIP:			07059

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:			23060-6148
		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
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wf-form4_163908636760731.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-12-07</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

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

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001242382</rptOwnerCik>
            <rptOwnerName>COX ROBERT C</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>Pres. &amp; COO, Insur. Operations</officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2021-12-07</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>F</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>184</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>1249.50</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>2013</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>21.984</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>401(K) Plan</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable></derivativeTable>

    <footnotes>
        <footnote id="F1">The information reported herein is based on Markel Corporation 401(K) Plan balances as of September 30, 2021.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/ Karen O. Earls, Attorney-in-fact for Robert C. Cox</signatureName>
        <signatureDate>2021-12-09</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>a2021confirmingstatementcox.htm
<DESCRIPTION>2021 - COX POA 01-04-2021
<TEXT>
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<pre>
CONFIRMING STATEMENT

This Statement confirms that the undersigned has authorized and designated Richard R. Grinnan,
Jeremy A. Noble, Karl M. Strait, Anna M. King, Brian D. Sorkin or Karen O. Earls (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) and Form 144s 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 or Form 144s
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 or Rule 144.

Date: 1/4/2021 | 1:55 PM EST             /s/ Robert C. Cox
                        Signature



                        Robert C. Cox
                        Printed Name
</pre>
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</SEC-DOCUMENT>
