(b St Petersburg, 1752; d Vienna, 1836).
Russ. mus. patron. Admiral in Russ. navy, then ambassador in several capitals, culminating in Vienna 1792–1812. Friend of Beethoven, whose three Op.59 qts. are ded. to him. From 1808 played 2nd vn. in his own qt., trying out Beethoven's chamber mus. for composer.