CREATE TABLE table_686 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

What is the earliest year where the result of the election was a retired republican hold?
SELECT MIN("First elected") FROM table_686 WHERE "Result" = 'Retired Republican hold'
SELECT MIN("First elected") FROM "table_686" WHERE "Result" = 'Retired Republican hold'