user: Question: What's the Place of birth listed that has an Elevator of Alexander III, and an Elector of Ruggiero di San Severino?
Columns: ['Elector', 'Place of birth', 'Cardinalatial title', 'Elevated', 'Elevator']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Konrad von Wittelsbach', 'Bavaria', 'Bishop of Sabina and Archbishop of Mainz', 'December 18, 1165', 'Alexander III']
SQL:

assistant: SELECT "Place of birth" FROM "Table" WHERE "Elevator" = 'Alexander III' AND "Elector" = 'Ruggiero di San Severino';