Table schema:
CREATE TABLE table_24706337_1 (ottoman_sultan VARCHAR, treaty_at_the_end_of_the_war VARCHAR)

Question: Who was the Ottoman Sultan where the treaty at the end of the war was the Treaty of Constantinople (1590)?
SQL: SELECT ottoman_sultan FROM table_24706337_1 WHERE treaty_at_the_end_of_the_war = "Treaty of Constantinople (1590)"