CREATE TABLE table_204_465 (id DECIMAL, "#" DECIMAL, "temple name" TEXT, "hangul" TEXT, "hanja" TEXT, "period of reign" TEXT, "personal name" TEXT, "relationship" TEXT, "note" TEXT)

who had the earliest reign ?
SELECT "temple name" FROM table_204_465 ORDER BY "period of reign" LIMIT 1
SELECT "temple name" FROM "table_204_465" ORDER BY "period of reign" NULLS FIRST LIMIT 1