GENERAL JAMES WILKINSON CLAIMED HE HAD OWNED DAUPHIN ISLAND DURING THE SPANISH REGIME SINCE MARCH 29, 1806 AND HE CLAIMED AMERICAN TITLE AFTER HE RAISED THE AMERICAN FLAG OVER MOBILE ON APRIL 15, 1813.

SEE "No. 14" on PAGE 499 of AMERICAN STATE PAPERS, PUBLIC LANDS, VOLUME 5 where representatives of his estate were denied title by the American land commissioners in 1828.
http://memory.loc.gov/cgi-bin/ampage?collId=llsp&fileName=032/llsp032.db&recNum=519