When was the successor who got his seat because of "until august 2, 1813" seated?
CREATE TABLE "table1_225096_4" (
  "district" text,
  "vacator" text,
  "reason_for_change" text,
  "successor" text,
  "date_successor_seated" text
);
SELECT "date_successor_seated" FROM "table1_225096_4" WHERE "reason_for_change"='Until August 2, 1813';