Name the marriagefor ceased to be consort of 29 september 1898
CREATE TABLE "house_of_schleswig_holstein_sonderburg_g" (
  "name" text,
  "birth" text,
  "marriage" text,
  "became_consort" text,
  "ceased_to_be_consort" text,
  "spouse" text
);
SELECT "marriage" FROM "house_of_schleswig_holstein_sonderburg_g" WHERE "ceased_to_be_consort"='29 september 1898';