CREATE TABLE table_15483 ("Name" TEXT, "Tenure" TEXT, "Courtesy title" TEXT, "Court Rank" TEXT, "revenues" TEXT)

What is the tenure of the person whose courtesy title is yamashiro-no-kami?
SELECT "Tenure" FROM table_15483 WHERE "Courtesy title" = 'yamashiro-no-kami'
SELECT "Tenure" FROM "table_15483" WHERE "Courtesy title" = 'yamashiro-no-kami'