What is Summoned, when Elected is "March 1298"?
CREATE TABLE "parliaments_of_king_edward_i" (
  "summoned" text,
  "elected" text,
  "assembled" text,
  "1st_member" text,
  "2nd_member" text
);
SELECT "summoned" FROM "parliaments_of_king_edward_i" WHERE "elected"='march 1298';