CREATE TABLE table_37106 ("Name" TEXT, "Birth" TEXT, "Marriage" TEXT, "Became Duchess" TEXT, "Ceased to be Duchess" TEXT, "Death" TEXT, "Spouse" TEXT)

What is the birth date of the duchess who married on 1 May 1844?
SELECT "Birth" FROM table_37106 WHERE "Marriage" = '1 may 1844'
SELECT "Birth" FROM "table_37106" WHERE "Marriage" = '1 may 1844'