user: Question: Who held the title of Ruler?
Columns: ['State', 'Type', 'Name', 'Title', 'Royal house']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Cai', 'Sovereign', 'Wu', 'Marquis', 'Ji']
SQL:

assistant: SELECT "Name" FROM "Table" WHERE "Title" = 'Ruler';