Table schema:
CREATE TABLE table_name_7 (elevated VARCHAR, elevator VARCHAR, cardinalatial_order_and_title VARCHAR)

Question: What is the date of elevation for the Cardinal elevated by Nicholas III to the title of Cardinal-Deacon of S. Eustachio?
SQL: SELECT elevated FROM table_name_7 WHERE elevator = "nicholas iii" AND cardinalatial_order_and_title = "cardinal-deacon of s. eustachio"