Which Reason is given when 1103 is the date for Became heir?
CREATE TABLE "1066_to_1135" (
  "heir" text,
  "status" text,
  "relationship_to_monarch" text,
  "became_heir" text,
  "reason" text,
  "ceased_to_be_heir" text,
  "monarch" text
);
SELECT "reason" FROM "1066_to_1135" WHERE "became_heir"='1103';