Nicolai von Wilm (born in Riga, 4 March 1834, died in Wiesbaden, 19 February 1911) was a German-Baltic composer. He studied at the Konservatorium Leipzig from 1851 to 1856, with Rietz and Moscheles among others. Later he held posts in Riga and St Petersburg as a conductor and a teacher and then went to Germany, first Dresden, then Wiesbaden.
He composed more than 250 works, mostly chamber music and lieder as well as numerous piano pieces.
There is a (near) complete work list on IMSLP.
Two recordings I have found after a quick search:
Romance for Piano and Horn op. 79, in a performance (https://www.youtube.com/watch?v=DSyZnx5dHkE) by Dymtro Taran, horn, and Olena Pavlova, piano.
and
Junges Leid op. 116, no. 1, for piano solo, in a performance (https://www.youtube.com/watch?v=gYOD9PQgb_E) by Latvian pianist Agnese Eglina.
Thanks - I thought the piano piece was really rather touching.
Don't forget his nonet, at IMSLP, thanks to Matesic.