CREATE TABLE table_6077 ("Image" CLOB, "Father" CLOB, "Birth" CLOB, "Ceased to be Duchess" CLOB, "Death" CLOB, "Husband" CLOB)

Which father had william iv as a husband?
SELECT "Father" FROM table_6077 WHERE "Husband" = 'william iv'
SELECT "Father" FROM "table_6077" WHERE "Husband" = 'william iv'