CREATE TABLE table_56637 ("Elector" TEXT, "Nationality" TEXT, "Faction" TEXT, "Order and Title" TEXT, "Elevated" TEXT, "Elevator" TEXT)

What is the Elector with a Nationality with roman, and an Elevator of urban iv, and an Elevated with 1261, december 17?
SELECT "Elector" FROM table_56637 WHERE "Nationality" = 'roman' AND "Elevator" = 'urban iv' AND "Elevated" = '1261, december 17'
SELECT "Elector" FROM "table_56637" WHERE "Elevated" = '1261, december 17' AND "Elevator" = 'urban iv' AND "Nationality" = 'roman'