The in Belgium approved stallion Avontuur (Jasper x Prins Oregon) is a 75% Gelderlander/Groninger horse. He is the victor of dozens of international showjumping competitions. His father Jasper (Thouroughbred x Groninger) was, known as Little One, a famous international showjumper and inherited.
The mother of Avontuur, the Gelderlander Ujolein, is the mother of Hercule Poirot too. He was a competitor in the Worldchampionship showjumping in 1994.