With the help of the Scottish Admiral Grieg, this 
With the help of the Scottish Admiral Grieg, this ruler won a war against King Gustav III of Sweden. At the Battle of Chesme, this ruler's navy sank an entire Turkish fleet, resulting in the favorable Treaty of Kucuk-Kaynarca. This ruler helped make Stanislaw Poniatowski the King of Poland and had a notable advisor named Grigory Orlov. This ruler conquered the Crimean Peninsula with the help of General Potemkin and helped plan the partitions of Poland with Frederick the Great and Maria Theresa. For 10 points, name this famed tsarina of Russia.
With the help of the Scottish Admiral Grieg, this ruler won a war against King Gustav III of Sweden.
{Catherine} the Great [or {Catherine II}]