André Rieu? I know he was born in Maastricht in the Netherlands, but the southernmost part of the province that it's in goes to the foothills of the Ardennes Mountains and the name Rieu is of Huguenot origin. I must admit that I'm not sure what the impact crater and horses have to do with it.
Debussy is a rayed impact crater on Mercury Debussy (foaled 26 February 2006) is an Irish Thoroughbred racehorse who won the Arlington Million in 2010. Debussy Heights is a minor mountain range rising to 1,300 metres (4,300 ft) (at Ravel Peak) east of Mozart Ice Piedmont in the north part of Alexander Island Phew!