Peter Graf von Lacy (Russian: ???? ?????´??? ??´???, tr.
Pyotr Petróvich Lássi; English: Pierce Edmond de Lacy; Irish: Peadar (Piarais Éamonn) de Lása; 26 September 1678 – 30 April 1751) was an Irish military commander who served in the Imperial Russian army, he was one of the most successful Russian imperial commanders before Rumyantsev and Suvorov.
During a military career that spanned half a century, he professed to have been present at a total of 31 campaigns, 18 battles, and 18 sieges.
He died at Riga, of which he for many years served as governor.