CREATE TABLE table_203_476 (id DECIMAL, "no." DECIMAL, "title  ( latin ) " TEXT, "title  ( english translation ) " TEXT, "subject" TEXT, "date" TEXT)

what is the only subject on 23 may 1920 ?
SELECT "subject" FROM table_203_476 WHERE "date" = '23 may 1920'
SELECT "subject" FROM "table_203_476" WHERE "date" = '23 may 1920'