Michael Haydn was a younger brother of the much more famous Josef Haydn. He was born in 1737 and died on Aug. 10 1806. His music is still played although his work is very much overshadowed by that of his elder brothr.
Michael remained close to his famous brother Joseph all of his life. Joseph highly regarded his brother and felt that Michael's religious musical works were superior to his own.
There are definitely disadvantages of being overshadowed by more highly rated composers. Mozart's symphony # 37 was often played while it was thought to be composed by Mozart. When it was discovered that most of the symphony is actually composed by Michael Haydn performances were much less frequent. Obviously the music was the same!
I have appended a video of a movement from a trumpet concerto. This celebrates the 205th anniversary of Michael Haydn's death.