Exhibit 99.1

[LETTERHEAD OF FIRST HORIZON]

December 17, 2010                    

First Horizon National Corporation
165 Madison Avenue
Memphis, Tennessee 38103

Ladies and Gentlemen:

     In connection with the issuance and sale of 26,316,249 shares of common stock, par value $0.625 per share, of First Horizon National Corporation, a Tennessee corporation (the “Company”) pursuant to the Underwriting Agreement, dated December 13, 2010, between the Company and Goldman, Sachs & Co., J.P. Morgan Securities LLC, Morgan Stanley & Co. Incorporated and the several underwriters listed therein, I (or counsel acting under my supervision) have examined such corporate records, certificates and other documents, and such questions of law, as I (or counsel acting under my supervision) have considered necessary or appropriate for the purposes of this opinion. Upon the basis of such examination, it is my opinion that:

     (1) The Company has been duly incorporated and is an existing corporation in good standing under the laws of the State of Tennessee.

     (2) The Shares have been validly issued and are fully paid and non-assessable.

     The foregoing opinion is limited to the laws of the State of Tennessee, and I am expressing no opinion as to the effect of the laws of any other jurisdiction.

     Also, I have relied as to certain matters upon information obtained from public officials, officers of the Company and other sources believed by me to be responsible, and I have assumed that the certificates for the Shares conform to the specimen thereof examined by me (or counsel acting under my supervision) and have been duly countersigned by a transfer agent and duly registered by a registrar of the Common Stock, as applicable, and that the signatures on all documents examined by me (or counsel acting under my supervision) are genuine, assumptions which I have not independently verified.

     This letter is furnished by me, solely in my capacity as General Counsel of the Company. I hereby consent to the filing of this opinion as an exhibit to the Company’s Current Report on Form 8-K and, through incorporation, to the Company’s Registration Statement on Form S-3 (File No. 333-150448). In giving such consent, I do not thereby admit that I am in the category of persons whose consent is required under Section 7 of the Securities Act of 1933.