user: Question: What is the Elector with a Nationality with Roman, and an Elevator of Urban IV, and an Elevated with 1261, December 17?
Columns: ['Elector', 'Nationality', 'Faction', 'Order and Title', 'Elevated', 'Elevator']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Bertrand de Saint-Martin', 'French', 'neutral', 'Cardinal-bishop of Sabina', '1273, June 3', 'Gregory X']
SQL:

assistant: SELECT "Elector" FROM "Table" WHERE "Nationality" = 'Roman' AND "Elevator" = 'Urban IV' AND "Elevated" = '1261, December 17';