CREATE TABLE table_59573 ("Name" TEXT, "Father" TEXT, "Birth" TEXT, "Marriage" TEXT, "Became Duchess" TEXT, "Ceased to be Duchess" TEXT, "Death" TEXT, "Spouse" TEXT)

When was the duchess, who was married on 11 july 1643, born?
SELECT "Birth" FROM table_59573 WHERE "Marriage" = '11 july 1643'
SELECT "Birth" FROM "table_59573" WHERE "Marriage" = '11 july 1643'