Born, named C-Hunter de Nyze Z, the Zangersheide-bred sire was produced at an international level under the saddle of Switzerland's Paul Estermann.
The combination jumped together many successes with the young horses.
USA's Lucas Porter will take over the reins, in his aim to reach a higher level.
Castlefield's C Hunter is from the same Damline as Narazo de Nyze Z (by Nelson Z). The gelding placed second in last year's Al Rayyan CSI5* with Derin Demirsoy.