What is the Elector with a Faction of roman, and an Elevated with 1244, may 28?
CREATE TABLE "cardinal_electors" (
  "elector" text,
  "nationality" text,
  "faction" text,
  "order_and_title" text,
  "elevated" text,
  "elevator" text
);
SELECT "elector" FROM "cardinal_electors" WHERE "faction"='roman' AND "elevated"='1244, may 28';