CREATE TABLE table_name_21 (elevator VARCHAR(255), elevated VARCHAR(255), cardinalatial_title VARCHAR(255))
What is the elevator when elevated is May 16, 1288, and cardinalatial title shows Deacon of S. Adriano?
    
SQL: SELECT elevator FROM table_name_21 WHERE elevated = "may 16, 1288" AND cardinalatial_title = "deacon of s. adriano"